When five minutes remain, stop opening new hard questions. Make sure every item has an answer, then spend what is left on flags. How flagging works is in flagging questions on the digital ACT.
The order
First, scan for blanks. A blank is worse than a guess, because there is no penalty for a wrong answer. Second, open the flagged list and redo only the ones you can finish in the time you have. Third, leave a guess on anything you will not reach. How to use leftover time in general is in leftover time on a section.
Where the warning comes from
The testing app warns you at five minutes. You do not need the proctor to announce it. The clock itself is in the on-screen timer. The other tools you might use while you review, including the eliminator, are in digital ACT tools.
The bottom line
Blanks first, flags second. Do not spend the last five minutes on one question you already know you cannot finish.
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.