Pick one letter before the test and bubble that letter on every guess. Random switching among the four choices is slower and no smarter. There is no penalty for wrong answers, so every blank should get a mark. Guessing as a policy is in guessing on the ACT.
Why one letter
Math now has four choices. English and Reading already did. One letter hits about a quarter of those blanks in the long run. Changing letters because a streak “feels wrong” is superstition. Four-choice Math is in four answer choices on Math.
Use this after a two-pass, in the two-pass method. The last minutes on the digital test are for blanks and flags, in the last five minutes.
The bottom line
One letter. Every leftover blank. Then stop thinking about it.
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.