ACT Science
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ExploreAbout this exam
The ACT Science Test is the science portion of the ACT, a college admissions exam used by U.S. colleges and universities. According to ACT, more than two million students take the ACT each year, and the test is offered in both digital and paper formats, with the science section available as an optional add-on. ACT lists the Science Add-On fee at $5.00. The exam is intended for high school students preparing for college admission, including those who plan to study science or health-related fields and want a science score on their record. Rather than testing memorized facts, the section emphasizes scientific reasoning: reading descriptions of experiments and studies, interpreting data presented in tables and graphs, and evaluating whether conclusions are supported by evidence. Preparation should focus on timed practice with data-heavy passages, careful reading of experimental design, and familiarity with the question types. Because ACT does not publish detailed section specifications on the pages retrieved here, candidates should confirm current format, timing, and scoring details directly with ACT before registering. This page is an independent study resource and is not affiliated with or endorsed by ACT.
What you'll study
About ACT Science preparation
Is the ACT Science Test required?
No. ACT describes science and writing as optional, digital or paper, and lists a separate Science Add-On fee of $5.00. Students who want a science score, including many planning science or health careers, choose to add it. Check ACT's registration materials for current requirements and deadlines.
What does the Science section actually test?
It tests scientific reasoning rather than memorized content. You will read descriptions of experiments and studies, interpret data in tables and graphs, and judge whether conclusions follow from the evidence shown. Strong reading speed and graph literacy matter more than advanced science coursework.
How long is the section and how many questions are there?
The retrieved ACT materials do not state a time limit or question count for the science section, so those figures are not given here. Confirm current timing and item counts through ACT's official test-day and preparation pages before you build a pacing plan.
How hard is it compared with other sections?
Most students find the challenge is pace and data interpretation, not deep science knowledge. Passages often present unfamiliar experiments, so practice reading axes, units, and control groups quickly. Difficulty feels lower if you are comfortable with tables and graphs and higher if you read slowly.
Can I retake the test, and does the science score count?
ACT's retrieved pages do not state a retake policy, so confirm it with ACT. ACT does advertise superscoring your best sections, which means a stronger science score from a later attempt can help. Plan a retake only after reviewing which section limited your score.
What is the best order for studying?
Start with data interpretation: tables, graphs, and units. Then practice experimental design questions about variables and controls. Finish with evaluation questions that ask whether a hypothesis is supported. Do timed sets weekly and review every wrong answer to identify whether the error was reading, reasoning, or pacing.
What mistakes cost students the most points?
The most common errors are misreading axis labels or units, confusing correlation with causation, and answering from outside knowledge instead of the passage. Another frequent problem is spending too long on one hard passage. Practice skipping and returning so every question gets an answer.
How much does the science add-on cost?
ACT lists the Science Add-On at $5.00, separate from the base ACT test fee. ACT also states that fee waivers are available to those who qualify. Verify the total cost, including any late fees, on ACT's official fee page when you register.