ACT Science section: what it really tests and how to raise your score

Students study biology, chemistry, and physics for it. They review their AP notes and memorize formulas. Then they open the Science section on test day and find that almost none of it was relevant.

The section doesn't mainly test science knowledge. It tests how quickly and accurately you can read data, graphs, tables, experimental descriptions, and conflicting viewpoints under heavy time pressure.

Everything else on this page follows from that.

What's in the section

The ACT Science section has 6-7 passages, each with data in the form of graphs, tables, or experimental descriptions. You have 35 minutes for 40 questions, which is about 5 minutes per passage, reading included.

The passages come in three types:

Data Representation (2-3 passages). You get graphs and tables and are asked to read values, spot trends, interpolate, and extrapolate. If you can read a graph, you can answer these, whether or not you know anything about the topic.

Research Summaries (3-4 passages). You get descriptions of experiments (setup, procedure, results) and are asked about the method, the variables, the results, and what would happen if the experiment were changed. That takes an understanding of experimental design, and no content knowledge.

Conflicting Viewpoints (1 passage). Two or three scientists or students disagree about a phenomenon. You work out each position, where they agree and disagree, and which evidence supports whom. It is a reading comprehension passage with scientific vocabulary.

Notice what's missing: recalling facts, applying formulas, solving chemistry problems, naming biological structures. Science is the backdrop. The skills being tested are reading, interpretation, and reasoning.

Why students bomb it

Students who struggle with a section that barely tests science usually do so for one of three reasons.

They study the wrong things. Ten hours of biology and chemistry review for ACT Science is ten hours wasted, because the section doesn't test what was reviewed. The same ten hours spent reading graphs quickly, identifying experimental variables, and comparing conflicting claims will do far more.

They read too carefully. AP science courses train students to read scientific text slowly and thoroughly. ACT Science punishes that, because there isn't time. At about 5 minutes per passage, questions included, you can't read every word. Skim the text, look hard at the data, go to the questions, and let the questions tell you what to read closely.

They panic when they don't recognize the topic. The ACT uses unfamiliar scenarios on purpose: the spectral properties of distant galaxies, the breeding behavior of an organism you've never heard of, an industrial chemistry process that isn't in any textbook. Students who lean on content knowledge feel lost. Students who lean on data interpretation don't care what the topic is, because the skill doesn't change.

The approach that works

Strategy 1: data first, text later

Don't open a passage by reading the introduction. Look at the data first: the graphs, tables, and figures. Work out what's being measured, what the axes are, what the units are, and which way the trends run.

Then go to the questions. Many can be answered straight from the data without reading the text at all. For the ones that need context, the question itself tells you which part of the text to read.

This feels backwards to students who were taught to read the passage first. It's much faster, because you never spend time on text the questions don't ask about.

Strategy 2: identify the variables immediately

For Research Summaries, find the setup first: what was changed (independent variable), what was measured (dependent variable), and what was held constant (controlled variables).

Once you know those three, most of the questions get easier. "What would happen if the researcher increased X?" → Look at the data for what happened when X increased. "What was the purpose of Experiment 3?" → Find which variable changed between Experiment 2 and Experiment 3.

It takes seconds. Students who skip it end up rereading the passage several times because they never sorted the information in their heads.

Strategy 3: treat conflicting viewpoints as reading comp

Conflicting Viewpoints is the one passage type you do need to read carefully, and what you're reading for is the argument. What does Scientist 1 claim, and on what evidence? What does Scientist 2 claim? Where do they disagree?

If you've done well on a reading passage that set two sides of an argument against each other, you already have the skill. The scientific vocabulary is packaging.

The most reliable order: read Scientist 1, then answer the questions about Scientist 1 alone. Read Scientist 2 and answer those. Then do the comparison questions. That keeps the two viewpoints from blurring together.

Strategy 4: don't get stuck

At under 5 minutes per passage, you can't spend 3 minutes on one hard question. If a question isn't clear after 30 seconds, mark it, move on, and come back if there's time.

This matters more on Science than elsewhere because passage difficulty swings so much. Some passages are plain data reading; some are multi-experiment designs. Spend too long on a hard one early and you'll rush the easier ones later, losing points you should have had.

A rough budget: 4-5 minutes for a straightforward Data Representation passage, 5-6 minutes for a Research Summary, 6-7 minutes for Conflicting Viewpoints. Adjust for difficulty, but never go past 7 minutes on one passage.

Strategy 5: know the one Science topic they do test

This is the one exception to the "ACT Science doesn't test science" rule. The section usually includes 2-4 questions that need outside knowledge: basic concepts the passage doesn't give you.

They come from a small, predictable pool: pH and acidity, basic genetics (dominant/recessive), phases of matter, tectonic plates, basic cell biology, the relationship between wavelength and frequency, and a handful of others.

Learning this set (maybe 20-30 concepts) can pick up 2-4 free points. It's the only content review worth doing for ACT Science, and it takes about an hour.

The timing problem

Timing is the main obstacle on ACT Science, and the only way around it is practice.

40 questions in 35 minutes is about 52 seconds a question. Take out the time spent reading passages and looking at data, and you have roughly 30-40 seconds to think about each one.

The only way to get comfortable at that pace is timed practice, with a stopwatch and conditions close to the real thing. Untimed practice where you "try to go fast" doesn't count.

Practice protocol:

1. Take a full Science section, timed at 35 minutes.
2. Score it. Note which questions you missed and which passages took too long.
3. Review each miss for why you missed it, and not only for the right answer. A reading error? A data interpretation mistake? Timing?
4. Repeat with a new section, and track your score and timing over time.

Students who do this 8-10 times typically see a 3-5 point improvement on the Science section. It comes from speed and pattern recognition, not from learning new science.

The score ceiling without practice

Students planning to skip Science prep should know that Science has the lowest average score of any ACT section nationally, and it drags down more composites than any other section.

A student who scores 30+ on English, Math, and Reading but 25 on Science has a composite of 28-29 instead of 30-31. That can be the difference between merit scholarship tiers, or between admission and the waitlist at a competitive school.

The section is beatable. What makes it hard is the time pressure and an unfamiliar format, and the content is rarely the problem. Beatable still means preparing, though: the right kind of preparation reliably raises the score.

Putting it together

If you're taking the ACT and haven't practiced the Science format, you're leaving points on the table. The minimum that works:

1. Understand what the section tests (data interpretation, not science content). You've done this by reading this far.
2. Learn the passage types (Data Representation, Research Summaries, Conflicting Viewpoints) and the approach for each.
3. Memorize the ~20-30 outside knowledge concepts the section occasionally tests.
4. Do 8-10 timed practice sections with review after each one.
5. Track your pacing to make sure you finish every passage within 35 minutes.

For most students this takes 10-15 hours of focused practice over a few weeks. The return, typically 3-5 points on the Science section, is among the best per hour in ACT prep.

I don't prep ACT Science, or the ACT as a whole, though I'll work the ACT math section case by case. Whoever helps with Science should start where my diagnostic assessment starts: past the Science score, at the specific skills (data reading speed, experimental design, timing) where the points are going, with practice aimed there.

Michael Rainwater is the founder of Rainwater Private Tutoring and works with students in Athens, Alpharetta, Milton, Roswell, Sandy Springs, and across Georgia, nearly all of them over Zoom.