GRE Help - Learn by Concept

Concepts

• GRE Quantitative Reasoning

  • Algebra

    • Algebraic Fractions

      • How to evaluate a fraction

      • How to find excluded values

      • How to find inverse variation

      • How to simplify a fraction

      • How to solve for a variable as part of a fraction

    • Algebraic Functions

      • How to find f(x)

    • Equations / Inequalities

      • Factoring Equations+1 topic

        • How to factor an equation

      • Inequalities+4 topics

        • How to find the solution to an inequality with addition

        • How to find the solution to an inequality with division

        • How to find the solution to an inequality with multiplication

        • How to find the solution to an inequality with subtraction

      • Linear / Rational / Variable Equations+3 topics

        • How to find out when an equation has no solution

        • How to find the solution to a rational equation with LCD

        • How to find the solution to an equation

      • Quadratic Equation+2 topics

        • How to factor the quadratic equation

        • How to find the solution to a quadratic equation

    • Exponents

      • Exponential Operations+4 topics

        • How to add exponents

        • How to divide exponents

        • How to multiply exponents

        • How to subtract exponents

      • Exponential Ratios+1 topic

        • How to find a ratio of exponents

      • Exponents and Rational Numbers+2 topics

        • How to find a rational number from an exponent

        • How to find an exponent from a rational number

      • Exponents and the Distributive Property+1 topic

        • How to use FOIL

      • Other Exponents+1 topic

        • How to use scientific notation

      • Pattern Behaviors in Exponents+2 topics

        • How to find compound interest

        • How to find patterns in exponents

    • Expressions

      • Evaluating Expressions+1 topic

        • How to evaluate algebraic expressions

      • Rational Expressions+6 topics

        • How to add rational expressions with a common denominator

        • How to add rational expressions with different denominators

        • How to divide rational expressions

        • How to evaluate rational expressions

        • How to multiply rational expressions

        • How to subtract rational expressions with different denominators

      • Simplifying Expressions+1 topic

        • How to simplify an expression

  • Arithmetic

    • Basic Squaring / Square Roots

      • Factoring Common Factors of Squares and Square Roots+1 topic

        • How to find the common factor of square roots

      • Other Squaring / Square Roots+1 topic

        • How to find the square of an integer

      • Simplifying Square Roots+2 topics

        • How to find the common factors of squares

        • How to simplify square roots

      • Square Roots and Operations+5 topics

        • How to add square roots

        • How to divide square roots

        • How to find a ratio of square roots

        • How to multiply square roots

        • How to subtract square roots

    • Decimals

      • Basic Squaring / Square Roots+2 topics

        • How to find the square root of a decimal

        • How to square a decimal

      • Decimal Operations+4 topics

        • How to add decimals

        • How to divide decimals

        • How to multiply decimals

        • How to subtract decimals

      • Decimals with Fractions+3 topics

        • How to find decimal fractions

        • How to find the decimal equivalent of a fraction

        • How to find the fractional equivalent of a decimal

      • Ordering+1 topic

        • How to order decimals from least to greatest or from greatest to least

      • Other Decimals+1 topic

        • How to convert decimals to scientific notation

    • Fractions

      • Complex Fractions+5 topics

        • How to add complex fractions

        • How to divide complex fractions

        • How to find a complex fraction

        • How to multiply complex fractions

        • How to subtract complex fractions

      • Compound Fractions+1 topic

        • How to find a solution to a compound fraction

      • Decimals with Fractions+3 topics

        • How to find decimal fractions

        • How to find the decimal equivalent of a fraction

        • How to find the fractional equivalent of a decimal

      • Fractions and Percentage+3 topics

        • How to find a fraction from a percentage

        • How to find fractional percentages

        • How to find percentage from a fraction

      • Infinite Fractions+1 topic

        • How to find the amount of rational numbers between two numbers

      • Lowest Common Denominator+1 topic

        • How to find the lowest / least common denominator

      • Mixed / Improper Fractions+2 topics

        • How to find out a mixed fraction from an improper fraction

        • How to find out an improper fraction from a mixed fraction

      • Operations+4 topics

        • How to add fractions

        • How to divide fractions

        • How to multiply fractions

        • How to subtract fractions

      • Ordering+1 topic

        • How to order fractions from least to greatest or from greatest to least

      • Proportion / Ratio / Rate+6 topics

        • How to express a fraction as a ratio

        • How to find a ratio

        • How to find proportion

        • How to find rate

        • How to find the ratio of a fraction

        • How to find the volume of a solution

      • Reciprocals+1 topic

        • How to find the reciprocal of a fraction

      • Simplifying Fractions+1 topic

        • How to simplify a fraction

      • Whole and Part+2 topics

        • How to find the part from the whole

        • How to find the whole from the part

    • Integers

      • Absolute Value+1 topic

        • How to find absolute value

      • Counting+1 topic

        • How to find the number of integers between two other integers

      • Even / Odd Numbers+8 topics

        • How to add even numbers

        • How to add odd numbers

        • How to divide even numbers

        • How to divide odd numbers

        • How to multiply even numbers

        • How to multiply odd numbers

        • How to subtract even numbers

        • How to subtract odd numbers

      • Factors / Multiples+8 topics

        • Greatest Common Factor+1 topic

          • How to find the greatest common factor

        • Least Common Multiple+1 topic

          • How to find the least common multiple

        • Other Factors / Multiples+1 topic

          • How to factor a number

        • Prime Numbers+1 topic

          • How to find out if a number is prime

      • Negative Numbers+4 topics

        • How to add negative numbers

        • How to divide negative numbers

        • How to multiply negative numbers

        • How to subtract negative numbers

      • Number Line+4 topics

        • Graphing an Inequality with a Number Line+1 topic

          • How to graph an inequality with a number line

        • Other Number Line+1 topic

          • How to find value with a number line

      • Operations+5 topics

        • How to add integers

        • How to divide integers

        • How to find order of operations

        • How to multiply integers

        • How to subtract integers

      • Sequences+10 topics

        • Arithmetic Sequences+5 topics

          • nth Term of an Arithmetic Sequence+2 topics

            • How to find the next term in an arithmetic sequence

            • How to find the nth term of an arithmetic sequence

          • Other Arithmetic Sequences+1 topic

            • How to find the answer to an arithmetic sequence

        • Common Difference in Sequences+1 topic

          • How to find the common difference in sequences

        • Consecutive Integers+1 topic

          • How to find consecutive integers

      • Sets+1 topic

        • How to find the missing number in a set

    • Percentage

      • Decimals and Percentage+2 topics

        • How to find decimal equivalent to a percentage

        • How to find percentage equivalent to a decimal

      • Fractions and Percentage+3 topics

        • How to find a fraction from a percentage

        • How to find fractional percentages

        • How to find percentage from a fraction

      • Interest+1 topic

        • How to find simple interest

      • Other Percentage+1 topic

        • How to find percentage

      • Percent of Change+2 topics

        • How to find the percent of decrease

        • How to find the percent of increase

      • Profit Margin+1 topic

        • How to find amount of profit

      • Sale Prices+1 topic

        • How to find the sale price

      • Sales Tax+1 topic

        • How to find the amount of sales tax

      • Whole and Part+2 topics

        • How to find the part from the whole

        • How to find the whole from the part

    • Permutation / Combination

      • How to find permutation notation

      • How to find the greatest or least number of combinations

  • Data Analysis

    • Probability

      • Outcomes+1 topic

        • How to find the probability of an outcome

    • Statistics

      • Arithmetic Mean+1 topic

        • How to find arithmetic mean

      • Median+1 topic

        • How to find median

      • Mode+1 topic

        • How to find mode

      • Range+1 topic

        • How to find range

    • Venn Diagrams

      • Intersection+1 topic

        • How to find the intersection of a Venn Diagram

      • Union+1 topic

        • How to find the union of a Venn Diagram

  • Geometry

    • Coordinate Geometry

      • Graphing+2 topics

        • How to graph a function

        • How to graph a line

      • Lines+17 topics

        • Distance Formula+1 topic

          • How to find the length of a line with distance formula

        • Midpoint Formula+2 topics

          • How to find the endpoints of a line segment

          • How to find the midpoint of a line segment

        • Other Lines+3 topics

          • How to find out if a point is on a line with an equation

          • How to find the equation of a line

          • How to find the slope of a line

        • Parallel Lines+3 topics

          • How to find out if lines are parallel

          • How to find the equation of parallel lines

          • How to find the slope of parallel lines

        • Perpendicular Lines+3 topics

          • How to find out if lines are perpendicular

          • How to find the equation of a perpendicular line

          • How to find the slope of a perpendicular line

      • x and y Intercept+2 topics

        • How to find the equation of a curve

        • How to find x or y intercept

    • Plane Geometry

      • Circles+18 topics

        • Chords+1 topic

          • How to find the length of a chord

        • Clock Math+2 topics

          • How to find the angle of clock hands

          • How to find the distance between clock hands

        • Diameter+2 topics

          • How to find the length of the diameter

          • How to find the ratio of diameter and circumference

        • Radius+3 topics

          • How to find circumference

          • How to find the area of a circle

          • How to find the length of a radius

        • Sectors+5 topics

          • How to find the angle for a percentage of a circle

          • How to find the angle of a sector

          • How to find the area of a sector

          • How to find the length of an arc

          • How to find the percentage of a sector from an angle

      • Hexagons+1 topic

        • How to find an angle in a hexagon

      • Pentagons+2 topics

        • How to find an angle in a pentagon

        • How to find the area of a pentagon

      • Quadrilaterals+16 topics

        • Parallelograms+4 topics

          • How to find an angle in a parallelogram

          • How to find the area of a parallelogram

          • How to find the length of the side of a parallelogram

          • How to find the perimeter of a parallelogram

        • Rectangles+5 topics

          • How to find if rectangles are similar

          • How to find the area of a rectangle

          • How to find the length of the diagonal of a rectangle

          • How to find the length of the side of a rectangle

          • How to find the perimeter of a rectangle

        • Squares+4 topics

          • How to find the area of a square

          • How to find the length of the diagonal of a square

          • How to find the length of the side of a square

          • How to find the perimeter of a square

      • Triangles+22 topics

        • Acute / Obtuse Triangles+4 topics

          • How to find an angle in an acute / obtuse triangle

          • How to find the area of an acute / obtuse triangle

          • How to find the length of the side of an acute / obtuse triangle

          • How to find the perimeter of an acute / obtuse triangle

        • Equilateral Triangles+4 topics

          • How to find the area of an equilateral triangle

          • How to find the height of an equilateral triangle

          • How to find the length of the side of an equilateral triangle

          • How to find the perimeter of an equilateral triangle

        • Isosceles Triangles+3 topics

          • Acute / Obtuse Isosceles Triangles+2 topics

            • How to find an angle in an acute / obtuse isosceles triangle

            • How to find the perimeter of an acute / obtuse isosceles triangle

        • Right Triangles+7 topics

          • How to find an angle in a right triangle

          • How to find if right triangles are similar

          • How to find the area of a right triangle

          • How to find the height of a right triangle

          • How to find the length of the hypotenuse of a right triangle : Pythagorean Theorem

          • How to find the length of the side of a right triangle

          • How to find the perimeter of a right triangle

    • Solid Geometry

      • Cubes+4 topics

        • How to find the diagonal of a cube

        • How to find the length of an edge of a cube

        • How to find the surface area of a cube

        • How to find the volume of a cube

      • Cylinders+2 topics

        • How to find the surface area of a cylinder

        • How to find the volume of a cylinder

      • Prisms+3 topics

        • How to find the length of an edge of a prism

        • How to find the surface area of a prism

        • How to find the volume of a prism

      • Spheres+4 topics

        • How to find the diameter of a sphere

        • How to find the radius of a sphere

        • How to find the surface area of a sphere

        • How to find the volume of a sphere

• GRE Subject Test: Biochemistry, Cell, and Molecular Biology

  • Biochemistry

    • Cellular Metabolism

      • Cellular Respiration and Photosynthesis+5 topics

        • Help with Glycolysis

        • Help with Light Reactions

        • Help with the Calvin Cycle

        • Help with the Electron Transport Chain

        • Help with the Krebs Cycle

      • Other Metabolic Processes+4 topics

        • Help with Anabolism

        • Help with Catabolism

        • Help with Metabolic Regulation and Hormones

        • Help with Other Metabolic Processes

    • Chemical Principles

      • Help with Bonding

      • Help with Intermolecular Forces

      • Help with Thermodynamics and Energetics

    • Chemical Reactions

      • Help with Acid-Base Chemistry and pH

      • Help with Oxidation-Reduction Chemistry

    • Macromolecules and Enzymes

      • Enzymes+9 topics

        • Enzyme Principles+4 topics

          • Help with Enzyme Identification

          • Help with Enzyme Kinetics

          • Help with Enzyme Mechanics

          • Help with Enzyme Types

        • Enzyme Regulation+3 topics

          • Help with Enzyme Modification

          • Help with Inhibitors

          • Help with Other Regulatory Mechanisms

      • Macromolecules and Monomers+5 topics

        • Help with Compound Macromolecules

        • Help with Lipids

        • Help with Nucleic Acids

        • Help with Proteins and Amino Acids

        • Help with Saccharides and Carbohydrates

  • Cell Biology

    • Cellular Processes

      • Cellular Division+3 topics

        • Help with Meiosis

        • Help with Mitosis

        • Help with the Cell Cycle

      • Differentiation+6 topics

        • Help with Developmental Genes

        • Help with Developmental Proteins

        • Help with Developmental Stages

        • Help with Growth Factors

        • Help with Other Differentiation Regulation

        • Help with Stem Cells

      • Protein Regulation+5 topics

        • Help with Other Protein Regulation

        • Help with Protein Degradation

        • Help with Protein Modification

        • Help with Protein Transport

        • Help with Vesicle Transport

      • Signals, Communication, and Junctions+10 topics

        • Cellular Junctions+3 topics

          • Help with Junction Functions

          • Help with Junction Proteins

          • Help with Junction Types

        • Cellular Signals and Communication+5 topics

          • Help with Action Potentials and Synapses

          • Help with Hormones

          • Help with Receptors and Channels

          • Help with Second Messengers

          • Help with Signal Transduction

    • Cellular Structures and Functions

      • Cell Membrane and Cell Wall+4 topics

        • Help with Cell Wall Structure

        • Help with Membrane Structure

        • Help with Membrane Transport

        • Help with Other Membrane Functions

      • Cytoskeleton and Cell Motility+3 topics

        • Help with Cell Motility

        • Help with Cytoskeleton Functions

        • Help with Cytoskeleton Structures

      • Endoplasmic Reticulum and Golgi Apparatus+3 topics

        • Help with Endoplasmic Reticulum Function

        • Help with Golgi Apparatus Function

        • Help with Golgi Apparatus Structure

      • Extracellular Matrix+1 topic

        • Help with Extracellular Matrix Composition

      • Lysosomes+1 topic

        • Help with Lysosome Function

      • Mitochondria and Chloroplasts+3 topics

        • Help with Chloroplast Structure

        • Help with Evolutionary Theories

        • Help with Mitochondria Structure

      • Nucleus and Ribosomes+3 topics

        • Help with Nuclear Structure

        • Help with Nuclear Transport

        • Help with Ribosome Structure

      • Specialized Structures+2 topics

        • Help with Muscle Specialization

        • Help with Neural Specialization

  • Laboratory Practices

    • Help with Biochemical Tagging

    • Help with Genetic Cloning, Splicing, and Sequencing

    • Help with Identification Techniques

    • Help with Imaging Techniques

    • Help with Knockout and Mutation Analyses

    • Help with Other Laboratory Techniques

    • Help with Quantification Techniques

    • Help with Separation Techniques

  • Molecular Biology and Genetics

    • DNA

      • Chromosomes+4 topics

        • Help with Chromosome Abnormalities

        • Help with Chromosome Structure and Function

        • Help with Epigenetics

        • Help with Karyotypes

      • DNA Replication and Repair+4 topics

        • Help with DNA Repair Processes

        • Help with DNA Repair Proteins

        • Help with DNA Replication Processes

        • Help with DNA Replication Proteins

      • Mutation and Variation+2 topics

        • Help with Mutation Types

        • Help with Recombination

      • Prokaryotic Genome+2 topics

        • Help with Nucleoid Structure and Function

        • Help with Transduction, Conjugation, and Transformation

    • Gene Regulation and Genomics

      • Gene Regulation+5 topics

        • Help with Gene Regulation Proteins

        • Help with Operon Regulation

        • Help with Other Gene Regulation Principles

        • Help with Promoters

        • Help with RNA in Gene Regulation

      • Genomics+5 topics

        • Help with Gene Families

        • Help with Gene Mapping

        • Help with Genome Evolution

        • Help with Linkage

        • Help with Transposable and Repeated Elements

    • Inheritance

      • Help with Hardy-Weinberg

      • Help with Mendelian Inheritance

      • Help with Other Inheritance Patterns

    • RNA, Transcription, and Translation

      • Transcription and RNA+3 topics

        • Help with RNA Structure and Modification

        • Help with Transcription Processes

        • Help with Transcription Proteins

      • Translation and Proteins+6 topics

        • Help with Post-Translational Protein Modification

        • Help with Prokaryotic Translation

        • Help with Protein Functions

        • Help with Protein Structures

        • Help with Ribosome and tRNA Structure

        • Help with Translation Processes

    • Viruses

      • Help with Viral Genomics

      • Help with Viral Lifecycles

      • Help with Viral Replication

• GRE Subject Test: Biology

  • Animal Biology

    • Animal Development

      • Understanding Determination and Differentiation

      • Understanding Fertilization and Early Development

      • Understanding Organogenesis

    • Circulatory System

      • Understanding Circulatory Functions

      • Understanding Circulatory Structures

    • Digestive System

      • Understanding Digestive Functions

      • Understanding Digestive Structures

    • Endocrine System

      • Understanding Glands and Target Organs

      • Understanding Hormone Functions

    • Immunobiology

      • Understanding Antibodies and Antigens

      • Understanding Immunological Cells

      • Understanding Immunological Processes

    • Musculoskeletal System

      • Understanding Musculoskeletal Functions

      • Understanding Musculoskeletal Structures

    • Nervous System

      • Understanding Action Potentials and Ion Channels

      • Understanding Nervous System Functions

      • Understanding Nervous System Structures

    • Reproductive System

      • Understanding Gametogenesis

      • Understanding Reproductive Functions

      • Understanding Reproductive Structures

    • Respiratory System

      • Understanding Respiratory Functions

      • Understanding Respiratory Structures

  • Cell Biology

    • Cell Membrane and Organelles

      • Cell Membrane and Cell Wall+5 topics

        • Understanding Cell Junctions

        • Understanding Membrane Functions

        • Understanding Membrane Proteins

        • Understanding Membrane Structure

        • Understanding the Cell Wall

      • Other Organelles+6 topics

        • Understanding Lysosomes and Peroxisomes

        • Understanding Mitochondria and Chloroplasts

        • Understanding Ribosomes

        • Understanding the Cytoskeleton

        • Understanding the Golgi Body and Endoplasmic Reticulum

        • Understanding the Nucleus

    • Cell Metabolism

      • Understanding Fermentation

      • Understanding Glycolysis

      • Understanding Photosynthesis

      • Understanding Storage of Macromolecules

      • Understanding the Electron Transport Chain

      • Understanding the Krebs Cycle

    • Macromolecules

      • Other Macromolecules+3 topics

        • Understanding Carbohydrates

        • Understanding Lipids

        • Understanding Nucleic Acids

      • Proteins+3 topics

        • Understanding Protein and Enzyme Function

        • Understanding Protein Structure

        • Understanding Receptors

    • The Cell Cycle

      • Understanding Cell Division, Mitosis, and Meiosis

      • Understanding Cycle Regulation

      • Understanding the Cell Cycle

  • Divisions of Life and Viruses

    • Animalia

      • Identifying Animals

      • Understanding Types of Animals

    • Archaea

      • Identifying Archaea

      • Understanding Archaea

    • Bacteria

      • Identifying Bacteria

      • Understanding Bacteria

    • Fungi

      • Understanding Fungal Life Cycle and Reproduction

      • Understanding Fungal Structures

      • Understanding Types of Fungi

    • Plantae

      • Understanding Alternation of Generations

      • Understanding Types of Plants

    • Protista

      • Identifying Protists

      • Understanding Protists

      • Understanding Roles of Protists

    • Viruses

      • Understanding Animal and Plant Viruses

      • Understanding Bacteriophages

      • Understanding Viral Life Cycles and Replication

  • Ecology

    • Environmental Ecology

      • Understanding Chemical Cycles

      • Understanding Environmental Impacts

    • Organismal Ecology

      • Understanding Community Ecology

      • Understanding Food Webs and Food Chains

      • Understanding Mating and Social Interactions

      • Understanding Population Ecology

      • Understanding Trophic Energy

  • Evolution and Mutations

    • Evolutionary Factors

      • Understanding Genetic Drift

      • Understanding Hardy-Weinberg Equilibrium

      • Understanding Natural Selection and Fitness

    • Evolutionary History

      • Understanding Land Adaptations

    • Mutations and Variability

      • Understanding Polymorphisms

      • Understanding Types of Mutation

    • Speciation

      • Understanding Divergent and Convergent Evolution

      • Understanding Phylogenetics

      • Understanding Speciation

      • Understanding Types of Speciation

  • Genetics, DNA, and Molecular Biology

    • Chromatin and Chromosomes

      • Understanding Chromatin

      • Understanding Karyotypes and Chromosomes

      • Understanding Structures and Proteins in DNA

    • DNA Replication and Repair

      • Understanding DNA Repair

      • Understanding DNA Replication

    • Genetic Regulation

      • Understanding Epigenetics

      • Understanding Oncogenes

    • Genetic Sequences, Transcription, and Translation

      • Understanding Genetic Patterns

      • Understanding Introns and Exons

      • Understanding mRNA and Protein Modifications

      • Understanding Operons and Promoters

      • Understanding Transcription

      • Understanding Transcription Factors

      • Understanding Translation

    • Inheritance

      • Understanding Modes of Inheritance

      • Understanding Pedigrees and Punnett Squares

      • Understanding Prokaryotic Inheritance

  • Lab Techniques

    • Chromatography

      • Understanding Column Chromatography

      • Understanding Thin Layer Chromatography

    • DNA Analysis

      • Understanding Cloning and PCR

      • Understanding DNA Sequencing

      • Understanding Restriction Endonucleases and RFLPs

    • Electrophoresis and Blots

      • Understanding Other Blots and Gels

      • Understanding PAGE and SDS-PAGE

      • Understanding Western Blots

    • Genetic Manipulation

      • Understanding Knockouts

      • Understanding Recombinant DNA

      • Understanding RNAi

    • Immunochemistry

      • Understanding Immunological Stains

    • Microscopy

      • Understanding Electron Microscopy

      • Understanding Light Microscopy

    • Other Lab Techniques

      • Understanding Identification Techniques

      • Understanding Other Techniques

      • Understanding Separation Techniques

  • Plant Biology

    • Plant Nutrition and Hydration

      • Understanding Plant Metabolism and Photosynthesis

      • Understanding Water Transport

    • Plant Reproduction

      • Understanding Plant Development

      • Understanding Plant Hormones

      • Understanding Plant Reproductive Structures

    • Plant Structures

      • Understanding Plant Macrostructures

      • Understanding Plant Microstructures

• GRE Subject Test: Chemistry

  • Analytical Chemistry

    • Analyzing Data

      • Calibrations and Precision

      • Diagrams, Graphs, and Tables

      • Error

      • Other Statistics

      • Variance and Standard Deviation

    • Analyzing Reactions

      • Acid-Base Analysis

      • Equilibrium Constant

      • Indicators and Complexometry

      • Limiting Reagent

      • Oxidation-Reduction Analysis

    • Analyzing Solids

      • Gravimetric Analysis

      • Mass Spectroscopy

      • Solubility and Precipitation

    • Chromatography

      • Column Chromatography

      • Thin Layer Chromatography

    • Electrochemical, Environmental, and Other Analyses

      • Electrochemical Analyses

      • Other Analytical Methods

    • Spectroscopy

      • HNMR and CNMR Spectroscopy

      • IR Spectroscopy

      • Other Spectroscopy

  • General Chemistry

    • Acid-Base Chemistry

      • Acid-Base Reactions

      • Lewis, Brønsted-Lowry, and Arrhenius Definitions

      • pH

      • Titrations

    • Elements and the Periodic Table

      • Elements, Ions, and Isotopes+3 topics

        • Ions and Isotopes

        • Metals

        • Non-Metals

      • Periodic Trends+4 topics

        • Atomic Radius

        • Electron Affinity

        • Electronegativity

        • Ionization Energy

    • Molecules and Compounds

      • Bonds and Forces+4 topics

        • Covalent Bonding

        • Hydrogen Bonding

        • Ionic Bonding

        • Other Intermolecular Forces

      • Diagrams and Geometry+3 topics

        • Lewis Diagrams

        • Molecular and Electronic Geometries

        • VSEPR Theory

    • Nuclear Chemistry

      • Electron Configuration

      • Filling Orbitals

      • Nuclear Decay

      • Orbitals and Orbital Hybridization

    • Reaction Chemistry

      • Chemical Equations

      • Equilibrium Constant and Reaction Quotient

      • Oxidation-Reduction Reactions

      • Reaction Equilibrium

      • Reactions with Inorganic Compounds

  • Organic Chemistry

    • Biochemistry

      • Carbohydrates

      • Lipids

      • Nucleic Acids

      • Polymerization

      • Proteins

    • Functional Group Reactions

      • Carbonyls+4 topics

        • Aldehyde Chemistry

        • Carboxylic Acid Chemistry

        • Ketone Chemistry

        • Other Carbonyl Chemistry

      • Hydrocarbons+4 topics

        • Alkane Chemistry

        • Alkene Chemistry

        • Alkyne Chemistry

        • Terpene Chemistry

      • Other Groups+5 topics

        • Alcohol Chemistry

        • Amine Chemistry

        • Aromatic Chemistry

        • Halide Chemistry

        • Sulfide Chemistry

    • Mechanisms and Intermediates

      • Intermediates+3 topics

        • Carbocations

        • Free Radicals

        • Other Intermediates

      • Reaction Mechanisms+4 topics

        • Electrophilic Addition

        • Electrophilic Substitution

        • Nucleophilic Addition

        • Nucleophilic Substitution

      • Reaction Types+4 topics

        • Acid-Base Reaction

        • Elimination Reactions

        • Oxidation-Reduction Reaction

        • Substitution Reactions

    • Stereochemistry

      • Diastereomers

      • Enantiomers

      • Epimers

      • Isomers

  • Physical Chemistry

    • Kinetics and Kinematics

      • Energetics

      • Kinematics

      • Reaction Rates and Reaction Order

    • Quantum Chemistry

      • Orbitals and Bonding

    • Thermodynamics and Phases

      • Classifying Reactions+2 topics

        • Endergonic and Exergonic Reactions

        • Endothermic and Exothermic Reactions

      • Colligative Properties+3 topics

        • Boiling Point

        • Freezing Point

        • Vapor Pressure

      • General Thermodynamics+5 topics

        • Enthalpy

        • Entropy

        • Gibbs Free Energy

        • Heat and Temperature

        • Laws of Thermodynamics

      • Phases of Matter+6 topics

        • Gases+2 topics

          • Gas Laws

          • Real Gases

        • Solids and Liquids+2 topics

          • Properties of Liquids

          • Properties of Solids

• GRE Subject Test: Physics

  • Electromagnetics, Waves, and Optics

    • Electromagnetics

      • Circuits

    • Optics

      • Lenses

      • Mirrors

      • Polarization

      • Reflection and Refraction

    • Waves

      • Diffraction

      • Doppler Effect

      • Fundamental Properties

      • Interference

  • Mechanics

    • Newtonian Mechanics

      • Circular and Rotational Motion

  • Quantum Mechanics and Atomic Physics

    • Atomic Properties

      • Atomic Spectra

    • Quantum Mechanics

      • Fundamental Concepts

      • Square Wells/Particle in a Box

  • Special Relativity

    • Energy and Momentum

    • Four Vectors

    • Introductory Concepts

    • Length Contraction

    • Time Dilation

  • Special Topics

    • Astrophysics

• GRE Verbal Reasoning

  • Reading Comprehension

    • Multiple-Answer Questions

      • Analysis and Synthesis in Multiple-Answer Questions+4 topics

        • Analyzing the Text in Other Ways in Multiple-Answer Questions

        • Considering Other Explanations in Multiple-Answer Questions

        • Differentiating Between Main Ideas and Details in Multiple-Answer Questions

        • Drawing Conclusions and Making Inferences in Multiple-Answer Questions

      • Argument in Multiple-Answer Questions+2 topics

        • Analyzing Components of an Argument in Multiple-Answer Questions

        • Analyzing Point of View, Assumptions, and Bias in Multiple-Answer Questions

      • Meaning and Structure in Multiple-Answer Questions+3 topics

        • Summarizing and Describing Passage Content in Multiple-Answer Questions

        • Understanding the Meaning of Phrases, Sentences, and Paragraphs in Multiple-Answer Questions

        • Understanding the Meaning of Words in Multiple-Answer Questions

    • Quotation-Selection Questions

      • Identifying Quotations Based on Their Function in the Passage

      • Identifying Support and Evidence in the Passage

    • Single-Answer Questions

      • Analysis and Synthesis in Single-Answer Questions+2 topics

        • Analyzing the Text in Other Ways in Single-Answer Questions

        • Drawing Conclusions and Making Inferences in Single-Answer Questions

      • Argument in Single-Answer Questions+2 topics

        • Analyzing Components of an Argument in Single-Answer Questions

        • Analyzing Point of View, Assumptions, and Bias in Single-Answer Questions

      • Meaning and Structure in Single-Answer Questions+4 topics

        • Summarizing and Describing Passage Content in Single-Answer Questions

        • Understanding How Parts of a Text Relate in Single-Answer Questions

        • Understanding the Meaning of Phrases, Sentences, and Paragraphs in Single-Answer Questions

        • Understanding the Meaning of Words in Single-Answer Questions

    • Specific Questions Featuring the Except Structure

  • Text Completion

    • One-Blank Texts

      • Context Clues in One-Blank Texts +2 topics

        • Conjunctions and Text Logic in One-Blank Texts

        • Style, Intensity, and Connotation in One-Blank Texts

      • Parts of Speech in One-Blank Texts+3 topics

        • Adjectives and Adverbs in One-Blank Texts

        • Nouns in One-Blank Texts

        • Verbs in One-Blank Texts

    • Three-Blank Texts

      • Context Clues in Three-Blank Texts +2 topics

        • Conjunctions and Text Logic in Three-Blank Texts

        • Style, Intensity, and Connotation in Three-Blank Texts

      • Parts of Speech in Three-Blank Texts+7 topics

        • Nouns and Adjectives or Adverbs in Three-Blank Texts

        • Nouns and Verbs in Three-Blank Texts

        • Nouns, Verbs, and Adjectives or Adverbs in Three-Blank Texts

        • Three Adjectives or Adverbs in Three-Blank Texts

        • Three Nouns in Three-Blank Texts

        • Three Verbs in Three-Blank Texts

        • Verbs and Adjectives or Adverbs in Three-Blank Texts

    • Two-Blank Texts

      • Context Clues in Two-Blank Texts +2 topics

        • Conjunctions and Text Logic in Two-Blank Texts

        • Style, Intensity, and Connotation in Two-Blank Texts

      • Parts of Speech in Two-Blank Texts+6 topics

        • Nouns and Adjectives or Adverbs in Two-Blank Texts

        • Nouns and Verbs in Two-Blank Texts

        • Two Adjectives or Adverbs in Two-Blank Texts

        • Two Nouns in Two-Blank Texts

        • Two Verbs in Two-Blank Texts

        • Verbs and Adjectives or Adverbs in Two-Blank Texts