FREE GED Study Guide 2026: All 4 Subjects

This free GED study guide covers everything the four GED subject tests measure — Reasoning Through Language Arts, Mathematical Reasoning, Science, and Social Studies — organized to the current GED Testing Service content for each subject.^[1]

It’s interactive, not a wall of text: every subject module has built-in checkpoint quizzes, flashcards, and practice questions, so you learn by doing — not just reading.

The GED is four separate tests, each scored on a 100–200 scale and passed independently at 145. That’s great news: you study and conquer one subject at a time. Read a module, test yourself at each checkpoint, then drill gaps with our free practice test and flashcards. This guide is a high-yield overview of what each subject tests — not a full textbook.

GED Exam Snapshot

You don’t need an “overall” GED score — you need 145 on each of the four subjects.^[6] Here’s how the score levels work on every subject:

Module 1 · Reasoning Through Language Arts (RLA)

≈150 minutes; reading, language, and a written essay. The RLA test is built around reasoning with text: roughly 75% of the reading passages are informational (science, history, workplace documents) and about 25% are literary.^[2] You read closely, edit writing, and produce one analytical essay — the Extended Response.

1.1 Reading Comprehension & Analysis

Every reading question comes back to two skills: finding the Main idea and tracing the supporting details that develop it. From there the GED pushes into analysis — identifying the Author's purpose (to inform, persuade, entertain, or explain), the Tone (the author’s attitude, shown by word choice and Connotation), and the inferences you can logically draw from what’s on the page.

1.2 Language, Grammar & Editing

The RLA test embeds grammar and usage in editing tasks — you fix sentences within a passage rather than answer isolated grammar trivia. The highest-yield rules: Subject-verb agreement, correct verb tense, pronoun agreement and clarity, parallel structure, proper use of commas and apostrophes, and choosing standard English over informal or wordy phrasing.

1.3 The Extended Response (Essay)

The Extended Response is the part most test-takers worry about — and the most coachable. You read two passages arguing opposite sides of an issue, then write an essay analyzing which one builds the better-supported argument. The key mindset: you are not arguing your own opinion — you are judging whose case is stronger and proving it with Evidence from the text.^[2]

A strong response states a clear Claim up front, develops 2–3 body paragraphs that quote or paraphrase specific text evidence, and ends with a brief conclusion. Organization, transitions, and clean grammar all count toward the score.

Module 2 · Mathematical Reasoning

≈115 minutes; about 45% quantitative and 55% algebraic problem solving. A short opening section is no-calculator; after that you get an on-screen TI-30XS calculator and a formula sheet.^[3] So the GED rewards knowing which formula or method to apply, not memorizing every formula.

2.1 Quantitative Reasoning

This is the number-sense half of the test. Master fractions, decimals, and percents and how to convert among them; ratios and proportions (solve by cross-multiplying); exponents and square roots; and the Order of operations. Most real GED problems are word problems, so translate the words into an equation first.

2.2 Algebraic Reasoning

Algebra is the larger half (≈55%). Know how to solve linear equations and inequalities, work with the slope-intercept form y = mx + b, and find the Slope of a line as rise over run. You’ll factor and solve quadratic equations, evaluate functions, and interpret graphs on the coordinate plane.

2.3 Geometry & Measurement

Geometry questions lean on the formula sheet — so the skill is choosing the right formula and plugging in carefully. Know perimeter and area of rectangles, triangles, and circles; surface area and volume of common solids (boxes, cylinders, cones, spheres); and the Pythagorean theorem for right triangles.

2.4 Data, Statistics & Probability

The data strand tests reading graphs and tables, the measures of center, and simple probability. Know the difference between the Mean, Median, and Mode, plus the Range. Probability is favorable outcomes divided by total outcomes, written from 0 to 1.

Module 3 · Science

≈90 minutes; roughly 40% life science, 40% physical science, 20% earth & space science. The GED Science test is built on science practices — reading and interpreting data, evaluating evidence, and reasoning from experiments — far more than memorizing facts.^[4] You don’t need deep content; you need to think like a scientist about the passage in front of you.

3.1 Life Science

Life science is the biggest single area. Know cell structure and function, Photosynthesis and Cellular respiration, basic genetics and heredity (DNA, dominant/recessive traits), Natural selection and evolution, the human body systems, and how energy flows through an Ecosystem via the Food chain.

3.2 Physical Science

Physical science covers chemistry and physics basics: the Atom and the structure of matter, states of matter and physical vs. chemical changes, chemical reactions and conservation of mass, plus forces, motion, and energy. Know the difference between Kinetic energy (motion) and potential energy (stored), and that energy is conserved — it changes form but isn’t created or destroyed.

3.3 Earth & Space Science + Science Practices

Earth and space science is the smallest strand (~20%): the Water cycle, weather and climate, the Greenhouse effect, Earth’s structure and natural resources, and the solar system. Across all of Science, the science practices matter most — designing fair tests (one Independent variable, a measured Dependent variable, controls), reading data, and drawing evidence-based conclusions.

Module 4 · Social Studies

≈70 minutes; roughly 50% civics & government, 20% U.S. history, 15% economics, 15% geography & the world. Like Science, Social Studies emphasizes reading and reasoning — interpreting documents, maps, charts, and political cartoons — over rote dates.^[5]

4.1 Civics & Government

Civics is the biggest area, so invest here first. Know the U.S. Constitution and the Bill of Rights, the three branches of government and Separation of powers with Checks and balances, Federalism (national vs. state power), how a bill becomes a law, the role of Judicial review, and the rights and responsibilities of citizens in a Democracy.^[8]

4.2 U.S. History

History on the GED is about cause, effect, and primary sources, not memorizing every date. Recognize major eras and turning points — the founding and Revolution, the Constitution, the Civil War and Reconstruction, industrialization and immigration, the World Wars, the Civil Rights Movement — and be ready to interpret excerpts from documents like the Declaration of Independence or a famous speech.

4.3 Economics & Geography

Economics centers on Scarcity and how it drives Supply and demand, markets and prices, money and banking, and basic indicators like Gross domestic product and Inflation. Geography asks you to read maps and understand how physical features, resources, and human movement shape societies.

How to Use This GED Study Guide

Because the GED is four separate tests, the smartest plan is to conquer them one at a time:

• Pick one subject. Start with the subject you find hardest (often Math or RLA) so you give it the most runway.
• Read the module, then check yourself. Take the end-of-module checkpoint to see exactly which sub-topics need another pass.
• Check off as you go. Mark each section done in the Study Guide Contents — it raises your exam-readiness score.
• Drill weak spots. Send shaky topics into the flashcards and a practice test until your score clears 145 comfortably.
• Schedule that subject’s test — then repeat. Pass it, move to the next subject, and bank your wins one at a time.

GED Glossary

The high-yield GED terms across all four subjects in one place — hover any dotted term in the guide, or flip the whole deck here as a self-grading flashcard set.

Atom

The basic unit of matter, made of protons, neutrons, and electrons.

Author's purpose

The reason a text was written — to inform, persuade, entertain, or explain.

Bill of Rights

The first ten amendments to the U.S. Constitution, guaranteeing basic individual rights.

Cellular respiration

The process by which cells break down glucose to release usable energy (roughly the reverse of photosynthesis).

Checks and balances

The system by which each branch of government can limit the powers of the others.

Claim

A debatable statement an author argues for; the writer of an Extended Response must state a clear claim.

Connotation

The emotional or implied meaning of a word, beyond its literal (denotative) definition.

Democracy

A system of government in which power comes from the people, usually through elected representatives.

Dependent variable

The variable that is measured to see whether it responds to the independent variable.

Ecosystem

A community of living organisms interacting with their non-living environment.

Evidence

The facts, examples, and reasoning used to support a claim — central to both reading and writing on the GED.

Extended Response

The timed RLA essay analyzing which of two source passages presents the better-supported argument, scored on evidence and reasoning.

Federalism

The sharing of power between a national government and state governments.

Food chain

A sequence showing how energy flows from producers to consumers as one organism eats another.

Greenhouse effect

Warming caused when atmospheric gases trap heat that would otherwise escape to space.

Gross domestic product

The total value of all goods and services produced within a country in a given period (GDP).

Hypothesis

A testable, falsifiable proposed explanation, often an 'if…then…' prediction.

Independent variable

The variable the experimenter deliberately changes in an investigation.

Inference

A logical conclusion the reader draws from evidence in the text plus prior knowledge — not stated outright.

Inflation

A sustained rise in the general price level, which reduces the purchasing power of money.

Judicial review

The power of courts to declare a law or government action unconstitutional.

Kinetic energy

The energy of motion; potential energy is stored energy due to position or arrangement.

Linear equation

An equation whose graph is a straight line, with variables to the first power (e.g., y = 2x + 1).

Main idea

The central point or message a passage conveys — what the whole text is mostly about.

Mean

The average — the sum of all values divided by the number of values.

Median

The middle value of a data set arranged in order.

Mode

The value that appears most often in a data set.

Natural selection

The mechanism of evolution in which organisms better suited to their environment survive and reproduce more.

Order of operations

The sequence for evaluating expressions — Parentheses, Exponents, Multiplication/Division, Addition/Subtraction (PEMDAS).

Percent

A part per hundred; convert to a decimal by dividing by 100 (25% = 0.25).

Photosynthesis

The process by which plants use sunlight, carbon dioxide, and water to produce glucose and oxygen.

Probability

The likelihood of an event, expressed from 0 (impossible) to 1 (certain), as favorable outcomes ÷ total outcomes.

Proportion

An equation stating that two ratios are equal; solved by cross-multiplying.

Quadratic equation

An equation containing a squared variable (ax² + bx + c = 0); its graph is a parabola.

Range

The difference between the highest and lowest values in a data set.

Ratio

A comparison of two quantities by division (e.g., 3 to 4, or 3:4).

Scarcity

The basic economic problem that resources are limited while human wants are unlimited.

Separation of powers

Dividing government authority among the legislative, executive, and judicial branches.

Slope

The steepness of a line: rise over run, the change in y divided by the change in x; the value m in y = mx + b.

Subject-verb agreement

A grammar rule requiring a singular subject to take a singular verb and a plural subject a plural verb.

Supply and demand

The economic relationship between how much producers offer and consumers want, which sets price at equilibrium.

Supporting detail

A fact, example, statistic, or reason that explains, proves, or develops the main idea.

Tone

The author's attitude toward the subject, revealed through word choice (e.g., formal, critical, hopeful).

Topic sentence

The sentence (often first) that states the main idea of a paragraph.

Water cycle

The continuous movement of water through evaporation, condensation, precipitation, and collection.

Y-intercept

The point where a line crosses the y-axis (where x = 0); the value b in y = mx + b.

GED Study Guide FAQ

References

1. 1.GED Testing Service. “About the GED Test.” ged.com. ↑
2. 2.GED Testing Service. “Reasoning Through Language Arts (RLA).” ged.com. ↑
3. 3.GED Testing Service. “Mathematical Reasoning.” ged.com. ↑
4. 4.GED Testing Service. “Science.” ged.com. ↑
5. 5.GED Testing Service. “Social Studies.” ged.com. ↑
6. 6.GED Testing Service. “GED Scores & Score Levels.” ged.com. ↑
7. 7.U.S. Congress. “The Legislative Process.” congress.gov. ↑
8. 8.National Archives. “The Constitution of the United States.” archives.gov. ↑
9. 9.U.S. Geological Survey. “The Water Cycle.” usgs.gov. ↑
10. 101.National Human Genome Research Institute. “Cell (Genetics Glossary).” genome.gov, accessed 19 June 2026. ↑
11. 102.NASA. “The Causes of Climate Change.” climate.nasa.gov, accessed 19 June 2026. ↑
12. 103.National Center for Education Statistics. “Economics resources.” nces.ed.gov, accessed 19 June 2026. ↑

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