Confirm whether blank answers outperform random guesses mathematically when penalties exist. If penalties are mild, skipping may waste opportunities.
Mark uncertain items for review if the interface allows, but avoid endless toggling—two passes maximum keeps rhythm steady.
Align attempts with your strengths first when section order is flexible; secure marks early to reduce panic later.
Negative marking math
Before guessing, estimate expected value: if wrong answers cost more than one-fourth of a right answer, random guesses rarely help unless you can eliminate options.
Flag and return
If the interface allows marking for review, set a hard rule: second pass only for flagged items, not entire paper rereads.