Navigation habits — flagging, skipping and returning without losing seconds.
Never leave a question blank. If a question is not yielding, pick the most plausible option, flag it, and move on. A guessed answer keeps the mark in play; a blank guarantees nothing. The flag is what turns a guess into a deliberate decision to return rather than a defeat.
Give every question one honest attempt at pace. The moment you catch yourself re-reading the same line or re-doing the same calculation, that is the signal: answer, flag, move. One stubborn question can quietly cost you two or three others at the end of the section — the clock does not refund heroics.
Be selective. Flag the questions you genuinely believe a second look can crack — usually long-but-doable data sets, not the ones you found impossible.
At the end of a section the review screen lists every question with its flagged and answered status, and the navigator lets you jump straight to any of them. Go to your flags first, then any unanswered items. Change an answer only when you can name the reason the new one is right — first instincts are usually worth keeping otherwise.
Practice this loop in every timed session so it is automatic on the day. AceUCAT's runner replicates the flag, navigator and review screens exactly for this reason.