- ACT Science is optional: The Enhanced ACT includes an optional 40-question, 40-minute Science section. It is scored separately and does not affect the main Composite score. (ACT)
- Science tests reasoning more than memorization: Students work with scientific data, experiments, graphs, tables, and competing explanations to interpret information, draw conclusions, and evaluate evidence. (ACT)
- Three core skills drive the section: ACT Science measures Interpretation of Data, Scientific Investigation, and Evaluating Scientific Arguments and Models with Evidence. (ACT)
- The section can strengthen a student's STEM profile: Students who take Science receive a separate Science score and, when they also take Math, a STEM score based on their Math and Science performance. (ACT)
- Taking Science is a strategic choice, not simply a way to shorten the test: Students should consider their target colleges, intended major, strengths, and whether a Science score could add value to their application.
- Practice should focus on data interpretation and reasoning: Students can improve by working with ACT-style graphs, tables, experiments, and scientific arguments under timed conditions rather than spending most of their preparation memorizing science facts.
The ACT Science section has changed significantly with the Enhanced ACT. For the current Enhanced ACT, Science is an optional 40-question, 40-minute section that measures interpretation, analysis, evaluation, reasoning, and problem-solving in scientific contexts. It does not contribute to the main Composite score, which is now calculated from English, Math, and Reading. (ACT)
Percentile note: The percentile comparisons in this article are based on ACT-tested high school graduates from the 2023, 2024, and 2025 graduating classes and apply to ACT tests taken from September 2025 through August 2026. (ACT)
The table shows that scoring high in the Science section is slightly harder than in the other sections. For example, a 33 in English places you ahead of 96% of test-takers, while the same score in Science puts you ahead of 99%. That means fewer students reach top scores in Science, making it a tougher section overall.
This article covers everything you need to know about the ACT Science section. We begin by briefly talking about what it is and what makes the ACT Science section optional. We also discuss whether you should skip it, how colleges view it, and how to include it in your prep plan.
Understanding the ACT Science Passage Types and Reporting Categories
The ACT Science section presents scientific information in several formats. Knowing what type of passage you are looking at can help you decide where to focus your attention before answering the questions.
Data Representation
These passages present information through graphs, tables, diagrams, and other visual displays. Questions typically ask you to identify trends, compare values, interpret relationships, or make predictions from the data.
Research Summaries
These passages describe one or more scientific experiments, including the procedures, variables, results, or conclusions. Questions may ask you to understand the experimental design, interpret results, or predict what would happen if the experiment were changed.
Conflicting Viewpoints
These passages present two or more explanations or hypotheses about the same scientific phenomenon. Questions require you to compare the viewpoints, identify differences in their assumptions, and determine which evidence supports or challenges a particular explanation.
The ACT Science test uses these three passage formats to assess scientific reasoning rather than simply testing whether students can recall facts. (ACT)
ACT Science Reporting Categories
The questions fall into three main reporting categories:
- Interpretation of Data: Reading and analyzing information presented in graphs, tables, and diagrams, including identifying trends and drawing conclusions.
- Scientific Investigation: Understanding experimental procedures, variables, controls, and how experiments can be modified or extended.
- Evaluating Scientific Arguments and Models with Evidence: Evaluating scientific claims, models, explanations, and conclusions using the evidence provided.
The Enhanced ACT also incorporates engineering and design contexts, requiring students to consider goals, constraints, tradeoffs, and evidence when working through real-world design problems. (ACT)
The STEM Score: What Happens to Your Science Score?
Taking the optional Science section can give students more than a standalone Science score.
Students who take Science and also complete the Math section receive a STEM score, which combines their Science and Math performance. The main ACT Composite score, however, continues to use only English, Math, and Reading. (ACT)
This creates a useful distinction:
- Composite score: English + Math + Reading
- Science score: Reported separately
- STEM score: Based on Math + Science
For students considering STEM-related programs, taking Science can therefore provide an additional way to demonstrate scientific reasoning and quantitative skills.
A Faster Way to Work Through Passages: Questions-First Strategy
The ACT Science section is heavily driven by the information provided in the passage, charts, tables, and figures. You do not necessarily need to read every word before looking at the questions.
A questions-first strategy can help you focus your attention where it matters.
Step 1: Look at the questions first
Before reading the entire passage, quickly scan the questions. Identify whether they refer to a particular experiment, figure, variable, result, or viewpoint.
Step 2: Go directly to the relevant information
Once you know what the question is asking, locate the graph, table, paragraph, or experiment that contains the necessary information.
Step 3: Read only the context you need
Read the surrounding information carefully enough to understand what the data represents. Pay attention to labels, units, variables, conditions, and qualifiers.
Step 4: Answer from the evidence
Use the information provided rather than relying on what you remember from science class. If two answer choices seem plausible, return to the data and identify which one is directly supported.
Step 5: Skip and return when necessary
ACT itself recommends answering easier questions first, using logic on harder questions, and returning to difficult questions if time remains. There is no penalty for guessing, so students should aim to answer every question. (ACT)
Tip: Questions-first does not mean ignoring the passage. It means using the questions to decide which parts of the passage deserve your closest attention.
What is the ACT Science section
The Science section on the ACT test evaluates the student’s scientific skills by using data and arguments presented in charts and passages.
It’s important to remember that the section doesn’t require the student to answer questions from Science concepts or formulas they might have memorized. Instead, the questions will test data interpretation, analysis, and scientific reasoning based on the given passages. To that extent, it is comparable to reading comprehension questions.
The section allows 35 minutes within which to answer 40 questions; that’s an average of a little over 52 seconds per question.
Is the ACT Science section optional?
Yes. Science is optional on the Enhanced ACT. The change began with national online testing in April 2025 and was extended to all national ACT administrations beginning in September 2025. Students who take Science receive a separate Science score, and students who also take Math receive a STEM score. (ACT)
The important point is that optional does not mean unimportant. Whether a student should take Science depends on their target colleges, intended major, academic strengths, and whether the additional score can strengthen their application.
What the ACT Science test covers
For students wondering what Science is on the ACT, here’s the answer: it covers physics, chemistry, and biology, along with their applications in areas like environmental Science and space research.
As mentioned earlier, this section tests the student’s ability to understand data presented through graphs and charts, research summaries, and scientific skills. Students would be tested on how well they can understand scientific experiments, their outcomes, and hypotheses.
The questions are spread across about 6 passages that present research summaries and data. Typically, one passage presents contrasting viewpoints on the same topic, and its questions require students to weigh the rationale behind the viewpoints.
The stress isn’t merely on how much a student remembers from the Science classes they took. That said, it’s worthwhile to note that being conversant with scientific concepts certainly helps.
Should students take the new digital test to avoid the Science section?
For most students, we recommend taking Science at least once before deciding to leave it out.
The right decision depends on the student's college list and goals. Taking Science can be worthwhile if:
- A student's target colleges or programs consider or require a Science score.
- The student is applying to STEM-related programs.
- The student performs well on Science practice tests.
- The student wants to demonstrate scientific reasoning and data-analysis skills.
- The student may benefit from having a separate Science and STEM score.
Skipping Science may make sense when a student's target colleges do not consider the score, the additional testing time creates significant fatigue, or preparation for Science would take time away from sections that have a greater impact on the student's goals.
The key is to make the decision after checking college policies and trying realistic Science practice, rather than assuming that optional means unnecessary.
What about when the paper test upgrades? Should I leave off the Science section then?
The paper ACT has already moved to the Enhanced ACT structure. The old future-tense framing should therefore be removed.
For current ACT administrations, Science is optional regardless of whether the student takes the ACT online or on paper for national testing. The Enhanced ACT's core Composite consists of English, Math, and Reading, while students who choose Science receive a separate Science score and can receive a STEM score if they also take Math. (ACT)
For school and district testing, however, Science optionality can depend on the testing program and the options selected by the district. Students taking the national ACT should therefore check the current registration options and their colleges' policies before deciding. (ACT)
Why would colleges require a Science section that the ACT says is optional?
That’s a fair question: if the ACT Science section is optional, why do some colleges require it? The answer can be discussed from multiple angles, including how the other optional areas - like essay writing, for instance - of standardized tests are treated.
The first and the most obvious answer lies in the kind of programs a college offers. Just like arts programs are rooted in arts and language, STEM programs pivot around science and math. Hence, it’s only natural that colleges want to learn a student’s aptitude and comfort level with science. The Science score can serve as an informal indicator of how well a student can handle scientific data.
In addition to this, colleges want to really see a student’s reasoning and data interpretation skills, that too within the context of science reports and research. During their coursework, students would be studying significant amounts of reports, so a student who does not have those basic skills will find it difficult to work through the courses. In short, the Science section tests the STEM-readiness of the student.
Then there’s the fact that an optional section isn’t irrelevant. It’s just that some courses may find the scores of the Science section more important and pertinent to their course. So it’s a matter of choice given to colleges if they would like to consider the scores of the Science section.
And finally, the boundaries. At the end of the day, ACT, Inc. is a testing body. It can set its own rules, but it cannot dictate college admission requirements or guidelines. If a college feels their course requires working intensively with science related topics, it will naturally set its criteria in order to identify students who are better suited for STEM courses. All that the ACT can do is conduct the test and leave the rest to the colleges.
How do I incorporate Science into a prep plan for this new test?
Start by determining whether Science is relevant to the student's college list and goals. If the student plans to take it, build Science practice into the regular ACT schedule rather than treating it as a completely separate subject.
Begin with official ACT-style questions and identify the student's weakest reporting category: Interpretation of Data, Scientific Investigation, or Evaluating Scientific Arguments and Models with Evidence. (ACT)
Then add the questions-first strategy:
- Preview the questions.
- Identify the relevant graph, table, experiment, or viewpoint.
- Read the necessary context carefully.
- Answer using the evidence provided.
- Skip difficult questions and return to them later.
- Review mistakes by skill type.
Students should also practice distinguishing what the data actually shows from what they assume it shows. This is particularly important when working with graphs, tables, experimental results, and scientific claims.
Finally, use timed practice to build pacing. The current Science section gives students 40 minutes for 40 questions, so students need to balance careful interpretation with efficient decision-making. (ACT)
Train students to focus on scientific reasoning, and not memorizing formulas or notations. The ACT Science section tests their ability to interpret research summaries, studies, and hypotheses, not recall complex facts.
Also, teach them how to analyze experiments and recognize their limitations. For example, a study on Venezuelan diets can’t be used to generalize about Brazil or Colombia, even if they're neighboring countries.
Finally, ensure ample test practice. Use EdisonOS to schedule timed mock ACTs with high-quality questions and practice under timed conditions. This practice will help them handle time pressure and manage their time better.
Summing up
By making the ACT Science section optional, the testing body has only given students a choice; it has not undermined the importance of that section for relevant programs.It tests key skills like data interpretation, logical reasoning, and scientific analysis. These skills matter mainly across subjects and STEM college programs.
As a parent or a tutor, it’s your role to explain to the students that the decision to take it should depend on their strengths, target schools, and long-term goals. Skipping it might offer short-term relief, but taking it can strengthen your overall application. Help them focus on building reasoning skills, practicing with real questions, and taking timed mock tests to boost confidence and performance.
To understand how EdisonOS can help you in this journey, why not book a call with one of our ACT experts right now?
