ACT originally stood for American College Testing—the name of the organization that created the exam. Today most people just call it the ACT; the letters are not expanded on score reports or college applications. What matters for admissions is your score, not the acronym. Part of what is the ACT.
Brief history
The ACT launched in 1959 as an alternative to the SAT, emphasizing curriculum-based skills in English, Math, Reading, and Science. Over decades it became one of the two main U.S. college admissions tests, accepted by virtually all four-year colleges.
What the ACT measures today
On the enhanced ACT (2025 and later), the Composite score averages English, Math, and Reading. Science and Writing are optional sections reported separately. The test still focuses on skills you build in high school—not memorized trivia. Full overview: what is the ACT. Recent changes: enhanced ACT changes explained.
ACT vs SAT
Both are accepted for college admissions. The ACT tends toward faster pacing and includes a Science section (optional now); the SAT has different section structure and timing. Many students take diagnostics of both. Compare: ACT or SAT: which test.
More basics
Common questions answered in ACT FAQ. Ready to register? how to register for the ACT.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.