ACT Study Guide

Separate skill practice from exam simulation

The four learning topics in this collection offer compact exercises you can review carefully. Because the real assessment has its own structure and policies, use these forms to strengthen reasoning rather than to infer official timing or scores. Check the provider’s current description when deciding which optional components to take.

Math: select a model before computing

For geometry, write the relevant relationship and identify the quantities it requires. A radius and a diameter are different inputs; area uses square units and volume uses cubic units. For right triangles, distinguish the hypotenuse from the side opposite a chosen angle. In probability, count equally likely outcomes consistently and avoid double-counting overlapping sets. An average speed is total distance divided by total time, which is not generally the mean of two speed readings.

English: preserve meaning while repairing structure

Identify the sentence’s core before considering decorative phrases. A plural noun inside a prepositional phrase does not necessarily control the verb. A semicolon needs a complete clause on each side in the examples here, and a colon introducing a list follows a complete clause. For organization questions, connect the placement of a sentence to the paragraph’s purpose or sequence. Remove repetition while retaining necessary facts and the intended tone.

Reading: use the whole passage

Summaries should account for the central movement of a passage, not just one memorable detail. In paired passages, identify what both authors accept before describing their disagreement or added qualification. When a question asks about an author’s choice, explain what that choice does for the argument, atmosphere, or sequence. A possible real-world explanation is not automatically an inference supported by the supplied text.

Science: organize the evidence

Read axis labels, units, and table headings before comparing numbers. Identify the manipulated variable, measured response, and controlled conditions. Distinguish interpolation within observed values from extrapolation beyond them. When two models predict different outcomes, look for the observation that separates their predictions. Repeated trials help assess variability, but repetition does not remove a consistent instrument bias.

Review with a short error log

After each variant, classify misses as content gaps, data-reading errors, unsupported inferences, or execution mistakes. Explain one corrected example in your own words, then revisit it later. The shared bank intentionally repeats questions across different forms, so improvement on a familiar item should be checked against your ability to explain the method. Use official full-length resources separately for administration practice.

Official exam information

• ACT: Exam Sections, Structure and Timing

Provider information checked October 9, 2026. Confirm current registration, accommodation, and administration policies with the provider.