Optional section, timed practice

ACT Science Practice Tests

40 questions in 40 minutes across 6 passages of tables, graphs, experiments and competing viewpoints. Optional on the enhanced ACT, with its own score, and fully timed here.

Start Test 1All 20 tests
  • 40 questions6 passages
  • 40 minutesOne minute each
  • Data, experiments, viewpointsAll three formats
  • Every answer explainedWhich table, which row

About the ACT Science section

ACT Science is optional on the enhanced ACT and earns its own 1 to 36 score, which also feeds the STEM score (the average of Math and Science). The section has 40 questions in 40 minutes across 6 passages in three formats: data representation, research summaries and conflicting viewpoints. Most questions test how you read data and experiments; a few call on basic science knowledge.

Every test is free to take online, with explanations for all of its ACT Science practice questions.

Skills on this section

Interpretation of DataScientific InvestigationEvaluation of Models
Practice these topics first

All 20 Science sectional tests

  • Science section

    ACT Science Test 1

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 2

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 3

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 4

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 5

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 6

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 7

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 8

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 9

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 10

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 11

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 12

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 13

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 14

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 15

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 16

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 17

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 18

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 19

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

  • Science section

    ACT Science Test 20

    1. Easy14 Ques.
    2. Medium16 Ques.
    3. Hard10 Ques.
    • 40 questions
    • 40 min
    Start Test

How to approach it

Three habits that raise Science scores

  1. Read the question first

    Then find the one table, graph or paragraph it points to. Most questions use a single source, so do not read the whole passage before starting.

  2. Trace the trend

    As one variable goes up, does the other rise, fall or level off? Check units and axis scales before you commit.

  3. Pin each viewpoint down

    On conflicting-viewpoints passages, write a few words for what each scientist claims before answering any question about them.

Warm up with untimed Science topic practice, then take a test here. When sections feel steady, move up to a full-length test.

Keep going

The other sections

English50 questions, 35 minMath45 questions, 50 minReading36 questions, 40 minWriting Optional1 essay, 40 minFull-length testsAll sections, real timing

Science questions

Got questions? We have answers.

Short, direct answers about this part of the site and the ACT itself.

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Contact us

Is ACT Science required?

No. Since the enhanced ACT, Science is optional. It has its own 1 to 36 score and does not change the Composite, which averages English, Math and Reading. Students who take it also receive a STEM score, the average of Math and Science.

Do I need to memorize science facts?

Mostly no. The section tests reading data, understanding experimental design and weighing evidence. A small number of questions draw on basic biology, chemistry, physics or Earth science from school courses.

What are the three passage formats?

Data representation (graphs and tables), research summaries (one or more experiments and their results) and conflicting viewpoints (two or more explanations of the same phenomenon). Our tests include all three.

How is Science reported here?

Raw score and accuracy across the three reporting categories (Interpretation of Data, Scientific Investigation, and Evaluating Scientific Arguments and Models with Evidence), plus time per question and an explanation that names the table or figure each answer comes from.