Flag, keep moving, then use the review screen. The loop is skip now, return later, fill blanks last. Flagging itself is in how to flag questions. The review list is in the review screen.
Three passes on the clock
First pass: answer or flag. Second pass: open flagged items. Last half-minute: anything still unanswered, in the no-blank rule. Two-pass as a habit is in the two-pass method.
The bottom line
Flag is not a parking lot. It is a return ticket, then a blank check at the end.
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.