The GED Science test runs 90 minutes with no break, uses multiple-choice and technology-enhanced item types, allows a TI-30XS calculator, and provides needed formulas. It weighs reading and writing in science (30%), science concepts (40%), and mathematical reasoning in science (30%) across life, physical, and Earth and space content. Prepare by practicing variable identification, axis-first graph reading, and conclusions limited to what data show; a complete worked exercise below shows what that looks like. For fees, scheduling and jurisdiction rules, rely on ged.com.
What the GED Science test covers
Science is one of four separate GED subject exams. It lasts 90 minutes, includes two minutes of instructions and final review, has no break, and mixes multiple choice with fill-in-the-blank, drag-and-drop, select-an-area, and drop-down items.
The GED test consists of four subjects, and Science is one of them. You take it as its own computer-based exam and do not have to sit all four at once.
An onscreen TI-30XS calculator is available, and you may bring your own TI-30XS to a test center. If you test internationally, plan on the built-in virtual calculator only.
The official Educator Handbook describes scientific reasoning in three skill areas: reading and writing in science (30%), science concepts (40%), and mathematical reasoning in science (30%). These are skill weightings, not a promise of how many questions fall in each science topic.
Sources: Test Subjects - GED — Science subject overview; GED Educator Handbook Edition 7 — Test basics and Science test overview
The three science content areas
The content splits across life science, physical science, and Earth and space science. The handbook's figures are approximate coverage, not a required split of your study time.
Practice in all three content areas. The examples in the table suggest contexts for review; the percentages describe the broad content areas, not separate weights for each example.
| Content area | Approximate coverage | Examples of practice contexts |
|---|---|---|
| Life Science | about 40% | Cells, genetics, evolution; the human body and health |
| Physical Science | about 40% | Matter and chemical reactions; motion and energy |
| Earth and Space Science | about 20% | Earth's systems; space and the universe |
Sources: GED Educator Handbook Edition 7 — Test basics and Science test overview
Connect a claim to the evidence
The official skill topics are reading for meaning in science, designing and interpreting science experiments, and using numbers and graphics in science. You do not need to memorize formulas; the test provides the information needed to answer.
Separate a claim from its evidence. In an original paper example, a passage claims that one fictional group grew taller than another and supplies both groups' mean heights. The measurements are the evidence. Your explanation should compare those measurements and state how they support the limited claim.
Then check the claim's scope. Measurements from two groups do not automatically explain a mechanism or establish what happens in every population. If a passage says a factor may cause a change, look for evidence before accepting a stronger claim.
| What the item shows you | Extract first | Weak habit to replace |
|---|---|---|
| A short experiment description | Independent variable, dependent variable, control | Skimming for vocabulary you recognize |
| A graph or data table | Axis labels and units, the overall trend, one exception | Matching numbers without reading the labels |
| A cause-effect passage | The claimed cause and the measured effect | Re-reading word-for-word hoping it gets clearer |
Sources: Test Subjects - GED — Science subject overview; Science - GED — Official Science subject page
Working with experiments: variables and controls
Decide what was deliberately changed (the independent variable), what was measured (the dependent variable), and what stayed the same, before reading the choices.
Original paper scenario: three otherwise comparable bean-plant pots receive 0 g, 5 g, and 10 g of fertilizer. Soil, watering and light are held constant, and height is measured after three weeks. Fertilizer amount is the independent variable and plant height is the dependent variable. The 0 g condition provides a comparison without added fertilizer. This is a diagram-reading exercise, not an instruction to conduct an experiment.
Two distinctions sharpen this. A control group establishes a baseline; controlled variables, also called constants, are conditions held the same across all groups, here soil, water, and light. Also match your conclusion to the design: with one pot per condition, an observed difference could reflect ordinary variation between plants, so the data support a tentative link, not a proof. Replication strengthens inference in any real study.
A zero-treatment group is not necessary for every useful comparison. In the light-duration exercise below, the groups compare several durations while other stated conditions are held constant. Identify which comparison answers the research question and which alternative explanations the design addresses.
Reading graphs: state the trend, not more
Read the units and scale first, describe the trend actually plotted, and refuse to extrapolate or assign causation beyond what the data support.
Original fictional graph description: a measured response is 2 units at 10 °C, rises to 8 units at 40 °C, and falls to 3 units at 60 °C. The statement "the response always increases with temperature" conflicts with the final measurement. Describe both the rise and fall. The values alone do not explain the mechanism or establish what happens above 60 °C.
Two variables changing together do not by themselves establish causation. A proposed mechanism is an explanation to evaluate, not proof on its own. Consider the experimental design and evidence supplied. A useful practice task is to write one sentence beginning "the data show" and another beginning "the data do not establish."
Sources: Test Subjects - GED — Science subject overview; Science - GED — Official Science subject page
Practice exercise: light and seedling growth
A complete original exercise on a stated fictional dataset: identify the variables and constants, compute a mean difference, and pick the conclusion the data actually support.
The scenario, data, and answer choices below are invented for practice, with every premise stated. Work through it on paper before revealing the answer, the way you would work a test item.
Practice exercise
A teacher wants to know whether daily light duration affects seedling growth. Thirty bean seedlings of the same variety and initial height are randomly assigned, ten each, to three groups. Group A receives 4 hours of light per day, Group B receives 8 hours, and Group C receives 12 hours. Every seedling receives the same soil, the same amount of water, and the same temperature and light intensity while illuminated. After 14 days, the mean heights are: Group A, 3.2 cm; Group B, 5.8 cm; Group C, 6.0 cm. (a) Name the independent variable, the dependent variable, and two conditions held constant. (b) On average, how much taller were Group B seedlings than Group A seedlings? (c) Which conclusion do these data support: (1) bean seedlings need exactly 8 hours of light, or (2) in this experiment, mean height rose with longer daily light up to 8 hours, with little further gain from 12 hours?
Show answer
(a) The independent variable is daily light duration. The dependent variable is mean seedling height after 14 days. Conditions held constant include soil, water amount, temperature, seed type, and group size. (b) 5.8 cm − 3.2 cm = 2.6 cm. (c) Conclusion 2.
Daily light duration is the deliberately changed variable. Mean height after 14 days is the measured outcome, and 5.8 cm minus 3.2 cm is 2.6 cm. Random assignment and the stated shared conditions support a fair comparison, but without information about variation in the measurements, the table alone cannot show whether either difference is statistically reliable. Conclusion 2 describes these observed means. Conclusion 1 claims an exact requirement that three tested durations cannot establish. The study also does not establish what happens in other varieties, over longer periods, or under other conditions.
Use subject knowledge to interpret a passage
Connect each content area to a concrete reading or data task. Keep the claim limited to the information the exercise provides.
For life science, use a passage about organisms or body systems and explain how its evidence supports a claim. If the question provides a model of inheritance, write down its assumptions before predicting an outcome; do not add rules the model does not state.
For physical science, identify what a quantity measures and keep units in the calculation. Original paper example: a device uses 12 units of energy in 3 minutes at a constant rate. Its stated average rate is 12 divided by 3, or 4 energy units per minute. Predicting 20 units over 5 minutes requires the additional assumption that the rate stays constant.
For Earth and space science, describe the pattern in a chart or diagram and identify the supplied evidence for an explanation. Distinguish an observation, such as a value rising across the plotted years, from a claim about why it rose.
Sources: Test Subjects - GED — Science subject overview; Science - GED — Official Science subject page; GED Educator Handbook Edition 7 — Test basics and Science test overview
Preparing and checking your readiness
Use the official free Science Study Guide to learn the tested skills, and the GED Ready practice test to judge whether you are ready to book. Optional routines below are study advice, not official requirements.
GED offers a free Science Study Guide explaining the skills being tested, and the GED Ready practice test for Science as a readiness check. Both are on the official site once you log in.
One optional routine is to interpret an experiment description and a graph, naming variables, units, and the observed pattern. Then review the content area in which you had difficulty. Add timed practice after you can explain your answers.
- Work through the free Science Study Guide on ged.com to see the tested skills
- Take the GED Ready practice test for Science before scheduling
- Practice with the free GED Science questions on this site, then rotate into the broader study guides
- Optional daily drill: one graph narration plus one experiment teardown, labeled as advice rather than a requirement
Scores and what passing takes
You need at least 145 in Science and in each of the other three GED subjects to earn the credential. Passing scores fall into three bands, and pricing varies by state.
The three levels are GED Passing Score (145-164), GED College Ready (165-174), and GED College Ready + Credit (175-200). Your results arrive in the Enhanced Score Report in your GED.com account.
Because every subject requires its own passing score, a strong Science result does not offset a lower one elsewhere. Test fees are not fixed nationally; the price varies by state, so check the cost for your jurisdiction when you register.
Sources: GED Educator Handbook Edition 7 — Test basics and Science test overview; Test Subjects - GED — Science subject overview
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