Most students should start studying for the ACT in the fall or winter of junior year, giving themselves 2–6 months before a spring test date. That timing leaves room for a retake senior fall while keeping the material fresh from your coursework.
The ideal timeline for most students
Junior year is the sweet spot. You have covered most tested math (through Algebra II and some geometry), and you still have senior-year test dates as backup. A common plan a lot of students follow: begin light prep in fall, test in the spring, and retake in the fall of senior year if needed.
Start earlier if you want a top score
Aiming for a 34–36 or balancing heavy extracurriculars? Starting in sophomore year or the summer before junior year gives you a longer runway, so you can study in low-stress, short sessions instead of cramming. See how long to study for the ACT to match your start date to your goal.
How your target score affects your start date
- Small gain (1–2 points): 4–6 weeks is often enough
- Moderate gain (3–4 points): start 2–3 months out
- Large gain (5+ points) or a 36 goal: start 4–6 months out; see hours to get a 36
Work backward from your test date
Pick your official date first, then count back. Reserve the final week for review and rest, schedule two full practice tests in the prior month, and fill earlier weeks with targeted drills. Build your routine with how to study for the ACT.
Don't start too late
Beginning a month before your only test date is risky. You lose the ability to retake before deadlines and have no time to fix timing issues. If you are already short on time, planning for at least two attempts is a good idea; read how many times to take the ACT.
The bottom line
Start junior year for most goals, earlier for top scores, and always leave room for one retake. The earlier you begin, the shorter and calmer each study session can be.
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.