Strategies for ACT Science: A 3-Step System for High Schoolers in 2026

The ACT Science section gives you 40 minutes to answer 40 questions across 6 to 7 passages. That is 1 minute per question. If you are reading each passage from top to bottom before touching a single question, you may be spending time on details that may never even be tested.

The Problem With Reading Everything First

ACT Science passages are deliberately packed with more information than you need. Every passage contains extra variables, additional trials, and supporting data that have nothing to do with the questions being asked. Reading it from front to back overloads you with irrelevant detail and eats into your limited time.

The students who score highest on ACT Science are not the ones who know the most biology or chemistry. They are the ones who know exactly what to look for and where to find it fast.

The following strategies are at the crux of our newly released ACT Science Practice Questions book. All 500+ questions in this book are solved using these strategies, with detailed explanations for correct and incorrect choices. Keep on reading!

Step 1: Start With the Question, Not the Passage

Before you read a single word of the passage or glance at a figure, read a question first. This single habit changes how the entire passage looks to you.

As you read each question, do two things:

• Spot your easy wins first. Some questions point directly to something concrete — "Table 1," "Trial 2," "Day 5," "Plant B." These are your quick, guaranteed points. Starting with them builds momentum and makes the harder questions feel more manageable.

• Mark the keywords. Every question contains clues: specific numbers, trial names, direction words like increase, decrease, maximum, or minimum, and references to a specific figure or table. Flagging these tells you exactly where to search.

• Simplify the question. Most ACT Science questions come down to one clear task: finding a value, spotting a trend, or making a comparison. Restating the question in just a few words keeps your search fast and focused.

For example, a question like "Based on Figure 1, as light intensity increased from 200 to 800 lux, how did the rate of photosynthesis change in Trial 3?" becomes simply: "Find photosynthesis rate trend, Trial 3, Figure 1." That is the only task. 

Step 2: Scan the Answer Choices Before the Passage

After reading the question, scan the answer choices before turning to the figure or passage. This tells you exactly what kind of task you are doing — and that changes your entire approach.

• Specific numbers in the choices mean you need a precise lookup or simple calculation.

• Trend words like increase, decrease, or constant mean you only need to track a direction, not find an exact value.

• Phrases from the passage mean you need to locate matching wording or a specific concept.

This preview also sets up the Process of Elimination. You do not always need to find the right answer; crossing out what is clearly wrong is just as powerful. Choices that show an opposite trend, fall outside the range shown in the graph, or restate passage information without actually answering the question can often be eliminated before you even look at the data.

Watch out for trap answers. The ACT frequently includes choices that copy exact numbers or phrases from a figure but apply them to the wrong trial, condition, or time point. 

Step 3: Now Look at the Figure, Table, or Passage

By the time you turn to the data, you know exactly what you are looking for and what form the answer should take. This is what makes the system fast.

For graphs and figures, spend a few seconds on structure first: identify the axes, check the units, note the legend, and get a feel for the overall trend before zeroing in on specifics. For tables, use the exact labels from your question to navigate directly to the right row and column. For Research Summaries passages, identify the independent and dependent variables before anything else. For Conflicting Viewpoints, read one perspective at a time and keep each scientist's claim clearly separate before attempting any comparison questions.

The key in every case: go to the data with a specific task. 

Seeing It in Action: A Worked Example

Here is what the three-step system looks like when applied to a real ACT Science question.

Example Question

Carbon exists in several forms, called allotropes, which have different molecular structures. Two common allotropes are diamond (a 3D lattice) and graphite (layered sheets). Recently, scientists have studied carbon nanotubes (CNTs), which are cylinders of rolled graphene.

      Thermal conductivity is a measure of a material's ability to conduct heat, measured in Watts per meter-Kelvin (W/m·K). Scientists conducted two experiments to compare the thermal properties of these allotropes.

Experiment 1

       Scientists measured the thermal conductivity of pure samples of diamond, graphite (measured parallel to the layers), and CNTs at a standard temperature of 300 K. The results are shown in Table 1. 

Step 1 — Read the question first.
Keywords to mark: molecular structure, carbon allotrope, ability to transfer heat, Experiment 1, support this prediction.

A scientist predicts that the molecular structure of a carbon allotrope affects its ability to transfer heat. Do the results of Experiment 1 support this prediction?

Simplified task: "Does Table 1 show that different structures produce different thermal conductivities?" This is a reasoning question, not a simple lookup. You need to evaluate whether the data backs up a claim.

Step 2 — Scan the answer choices.
All four choices combine a Yes/No judgment with a reason. That tells you immediately: you need to both find the data and evaluate it. Two say Yes, two say No — Process of Elimination will be very useful. Before touching the table, ask yourself: if structure does affect heat transfer, what would the data look like? Different allotropes should show different values.

Step 3 — Go to the table.
The passage tells you upfront that diamond, graphite, and CNTs all have different molecular structures. Now look at Table 1: diamond is 2,200 W/m·K, graphite is 3,980, CNTs are 3,500, and amorphous carbon is just 2. These values are dramatically different — exactly what you would expect if molecular structure affects heat transfer.

Answer: G — Yes; different allotropes showed significantly different thermal conductivities.

Notice the traps: Choice F says "Yes" but claims all allotropes had the same conductivity — directly contradicted by the table. Choice H introduces temperature as a variable, but the entire experiment was run at a single fixed temperature. Choice J sounds reasonable — both materials are carbon — but the passage explicitly states allotropes have different structures in the very first sentence.

What Comes Next

For more detailed strategies, passage-type breakdowns, trap answer walkthroughs, and fully worked examples — pick up the newly released ACT Science Practice Questions book by Vibrant Publishers. Every question is built around this system, with strategy-based explanations that show you not just the correct answer, but the exact reasoning process behind it. The book has:

• 500+ ACT Science questions 

• 1 Diagnostic Test & Mini Timed Practice Sets

• 1 full-length ACT Science test 

• Passage-type-based organization 

• Detailed, strategy-based explanations for correct and incorrect choices

• Online Resources: Science Vocabulary List and Graphics Guide

Other Recommended Resources

ACT Practice Tests
ACT English Practice Questions
ACT Math Practice Questions
ACT Reading Practice Questions

These resources are specifically designed to help you achieve your dream score on the Digital SAT through extensive, focused practice.

Also read:
What's on the ACT Science Section? Everything Students Need to Know in 2026
Understanding the Enhanced ACT Scoring System: A Complete Guide for Students
Changes in the ACT: What’s New in 2025 and How It Compares to the Past