GED Science Review Guide: What's Actually on the Test

The GED Science test doesn't require you to be a scientist — it tests whether you can think like one. This guide breaks down exactly what's on the test, how questions are formatted, and the most effective strategies for passing.

GED Science Test Overview

The GED Science test measures your ability to understand and interpret scientific information. Here are the key facts:

• Number of questions: 34–40
• Time limit: 90 minutes
• Passing score: 145 out of 200
• College-ready score: 170+
• Calculator: TI-30XS available on-screen
• Formula sheet: Provided during the test

The Three Content Areas

1. Life Science (40% of the test)

This is the largest section and covers:

• Cell biology: Cell structure, mitosis, meiosis, cell membranes, organelles
• Genetics and heredity: DNA, genes, dominant/recessive traits, Punnett squares, mutations
• Evolution and natural selection: Adaptation, survival of the fittest, fossil record, speciation
• Human body systems: Digestive, circulatory, respiratory, nervous, and immune systems
• Ecology: Food chains, ecosystems, energy flow, populations, symbiotic relationships

2. Physical Science (40% of the test)

Covers basic physics and chemistry:

• Motion and forces: Speed, velocity, acceleration, Newton's three laws, gravity, friction
• Energy: Kinetic vs. potential energy, conservation of energy, heat transfer (conduction, convection, radiation)
• Waves: Sound waves, light waves, electromagnetic spectrum
• Chemistry basics: Atoms, elements, compounds, chemical reactions, pH scale, states of matter
• Work and simple machines: Levers, pulleys, inclined planes, mechanical advantage

3. Earth and Space Science (20% of the test)

The smallest section but still important:

• Earth's structure: Layers of the Earth, plate tectonics, earthquakes, volcanoes
• Weather and climate: Atmosphere, air pressure, water cycle, climate change, greenhouse effect
• The solar system: Planets, rotation vs. revolution, tides, phases of the moon, seasons
• Earth's resources: Renewable vs. nonrenewable energy, conservation, natural cycles

Question Types You'll See

The GED Science test uses several question formats:

• Multiple choice: The most common type. Four answer choices, one correct answer.
• Drag-and-drop: You arrange items into the correct order or category (e.g., arranging steps of the scientific method).
• Fill-in-the-blank: You calculate an answer and type it in. These usually involve using the formula sheet.
• Short answer: One question requires a written response of 2–3 paragraphs analyzing an experiment or data set. This is worth significant points.

The #1 Skill You Need: Data Interpretation

Here's what most GED Science guides won't tell you: you can pass this test with minimal science knowledge if you're good at reading graphs and tables.

The majority of questions present you with a chart, graph, table, or experimental description and ask you to draw conclusions from it. The science vocabulary is secondary to your ability to:

1. Read axis labels and units carefully
2. Identify trends in data (increasing, decreasing, no change)
3. Compare two or more data sets
4. Distinguish between correlation and causation
5. Evaluate whether an experiment's conclusion is supported by its data

Study Strategy: How to Prepare Efficiently

1. Master data interpretation first — practice reading scientific graphs and tables daily. This alone can earn you 60%+ of available points.
2. Focus on life science — it's 40% of the test and the content is the most memorization-heavy. Learn the major body systems and basic genetics.
3. Learn the scientific method — know how to identify variables (independent, dependent, controlled), form hypotheses, and evaluate experimental design.
4. Practice with the TI-30XS calculator — know how to enter fractions, use the exponent key, and compute basic statistics.
5. Write practice CER responses — the short answer question is high-value and most students skip practicing it.
6. Take timed practice tests — 90 minutes goes fast when you're reading dense scientific passages. Practice pacing yourself to about 2–2.5 minutes per question.

Frequently Asked Questions