The final 15 minutes should make you feel fluent, not exhausted. Do a few easy calculations, outline one simple case structure and review your opening routine rather than attempting a difficult full case.

Check the practical setup too: water, paper, calculator rules if relevant, camera, audio and any meeting link. Removing small sources of uncertainty helps more than cramming one more framework.

Avoid reviewing a case that recently went badly or learning a new concept right before the interview. That can create unnecessary doubt when you need calm focus.

Use the same short routine every time so nerves do not force you to invent a warm-up on interview day: two minutes of easy arithmetic, three minutes to structure one prompt, two minutes to summarize a chart, then a quick check of camera, audio, paper and water. Stop with a few quiet minutes left rather than entering the interview still solving a practice problem.

Would you still do math in the warm-up if math is what makes you most nervous?