ACT Science: Everything You Need To Know

For years, the ACT Science section had a reputation that made students nervous before they ever opened a practice test. The word “science” alone was enough to make some students avoid the test entirely, preferring the more predictable SAT instead. 

But in reality, the ACT Science section has always been more about reasoning than memorization. Yes, you need some basic science background. You need to know how to read about and understand scientific data– because more than anything else, this section asks whether you can read data, understand experiments, compare explanations, and draw sensible conclusions from the information in front of you.

That makes this part of the ACT unusual. It doesn’t feel like a typical high school science test. You are not being asked to recall every term from your textbook or reproduce a lab from class. Instead, you are given charts, tables, brief research summaries, and competing explanations, then asked to think through what they mean. For some students, that is a relief. For others, it takes practice to adjust to the style. Either way, if you understand what the section is actually testing, it becomes much more manageable.

Is Science No Longer On The ACT?

Thankfully for many science-loving students, this rumor is false. But thankfully for many other students, who might not be so comfortable with science, there’s a little bit of truth to it. Before the new “Enhanced ACT,” the Science section was required for everyone. But today, the ACT Science section is optional for most students– and by the full rollout of the new version ACT, which will finish with the spring school day test dates, it will be optional for all students. 

But just because it’s no longer mandatory, that doesn’t mean it’s not important. For students who are strong in science or want to demonstrate their STEM skills, the Science section of the ACT can give them an important leg up. So no, you don’t have to take the ACT Science section… but it might help you out.

If you want to take the ACT Science section, it will not contribute to your composite score. That’s now an average of the three mandatory sections: Math, Reading, and English. Your Science score is reported separately. 

The question then becomes: is taking the ACT Science section worth it? That’s an individual choice. If you like science, or you’re applying to STEM-heavy programs, then yes, by all means you should take it. But if science isn’t your strongest area, you might decide that your time is spent maximizing your scores in other areas. 

What’s On The ACT Science Section?

The ACT describes the Science section as a measure of interpretation, analysis, evaluation, reasoning, and problem-solving skills in the natural sciences. The subject matter is drawn from biology, chemistry, Earth and space sciences, and physics. ACT also notes that advanced knowledge is not required, though students may need the kind of background knowledge they pick up in general introductory science classes

Getting into the specifics, the reporting categories break down this way:

•  Interpretation of Data – 40%-50% of questions.
• Scientific Investigation – 20% to 30% of questions.
• Evaluation of Models, Inferences, and Experimental Results – 25% to 35% of questions.

In plain English, that means a large chunk of the section is about reading graphs and tables correctly, another chunk is about understanding how experiments are designed, and another chunk is about deciding which conclusion is supported by the evidence. 

The Science section will present these reporting categories in three common passage formats: Data Representation, Research Summaries, and Conflicting Viewpoints. Data Representation accounts for about 25% to 35% of the section and focuses on charts, graphs, and tables. Research Summaries make up about 45% to 60% and center on one or more related experiments. Conflicting Viewpoints accounts for about 15% to 20% and asks you to compare competing explanations for the same scientific issue.

Is The ACT Science Section Hard?

That really depends on what you mean by “hard.” Obviously, these are standardized test questions– so you’re not running experiments or anything. But the learning curve comes with how you engage with the questions. The element that trips up lots of test-takers on this part of the exam is, surprisingly, speed.

The Science section has lots of dense material, and if you try to treat it exactly like either of the language arts sections or the Math section, you’re going to struggle. You can’t get caught on intimidating features like multiple variables and unusual vocabulary; instead, you have to slice out the information you actually need to answer the question, and that can take longer than you might think. 

That’s why even strong science students can struggle. Doing well in biology class does not automatically mean you will move efficiently through ACT Science passages. Classroom success and test-taking success overlap, but they are not the same thing!

The Science section rewards students who can find the relevant data fast, interpret it accurately, and keep going. And oddly enough, that’s why some students who do not think of themselves as “science people” often do better than expected once they learn the format. If you are solid at reading charts, identifying patterns, and thinking logically under time pressure, you may find this section much more approachable than its name suggests. A lot of the fear around ACT Science comes from misunderstanding what it actually measures.

The hardest passage type for many students is Conflicting Viewpoints (fortunately, the smallest category). That format gives you two or more explanations for the same scientific phenomenon and asks you to compare them. There is usually less raw data to lean on, so your reading precision matters more. You have to notice where the viewpoints agree, where they differ, and what each one would likely predict. 

Research Summaries can also be tricky if you lose track of the experiment design. Questions may ask about control groups, changes in procedure, or what would likely happen in an added trial. If you understand how the experiment is set up, these questions often become much easier. If you do not, they can feel random even though they are not.

Data Representation is the most straightforward section. But you still can’t rush through it. You have to make sure that you’re looking at the right data labels and making the right comparisons, and you have to make sure that you understand what the question is really trying to ask.

How to Study for the ACT Science Section

If you want to ace the ACT Science section, you need to have familiarity with both content and strategy. Even though you won’t be performing experiments in the ACT Science section, you’ll still need a basic command of high school science– and that means your prep should cover two tracks at once

. First, make sure you are comfortable with the level of science knowledge the ACT expects. You do not need graduate-level content, but you should be able to follow common ideas from biology, chemistry, Earth and space science, and physics. Terms like variable, control, trend, rate, and hypothesis should feel normal to you.

Second, and just as important, you need section-specific strategies. Learn how to read graphs without getting lost. Practice identifying what changed from one trial to the next. Train yourself to notice whether a question is asking for a direct observation, a reasonable inference, or a comparison between viewpoints. We’ve noticed that students improve fastest when they stop treating this section like random science trivia and start treating it like a pattern-based reasoning test.

Timed practice matters a lot here. Because pacing is such a big part of the challenge, untimed review alone will not prepare you for the real thing. You need experience making quick decisions. That includes knowing when to skim the passage first, when to go straight to the questions, and when to ignore extra detail that is there to distract you more than help you. This is also why official-style material is often the best way to study. The closer your practice is to the real ACT, the more useful it will be. The Science section has its own rhythm, and students tend to improve faster once that rhythm starts to feel familiar. 

You also need to review what you missed and figure out why you missed it. Did you misread the graph? Mix up two viewpoints? Miss a unit change? Run out of time because you spent too long decoding one passage? Those patterns tell you far more than your raw score alone, and analyzing these patterns is part of what separates high-scoring students from the rest of the pack.

Finally, make your choice about whether or not you’re taking the Science section early. If you think you want to take ACT Science, prep for it with enough lead time that it becomes a strength rather than an afterthought. If you decide to skip it on the enhanced ACT, then make that decision confidently and put your effort where it will help you most.

Prep Your Best for Science and the Rest!

The ACT Science section is still here, but it is no longer the same kind of requirement it used to be. The important thing is understanding what the section actually tests and deciding whether it belongs in your strategy.

If you do take it, remember that success usually comes from smart prep, not from trying to memorize every science fact you have ever learned. And that’s where we come in. Whether you plan to take the optional Science section or focus on the required core, strong preparation can help you walk in with a real plan and walk out with a score that reflects your ability. All Prep Expert®’s instructors are top 1% test-takers who know the Science section (and the rest of the test) inside and out. Check out our ACT course options to get ready for Science… and the rest of the test!