The night before a consulting interview is usually better spent consolidating than doing a heavy new round of cases.

A tired candidate may perform worse on mental maths and communication even after squeezing in another mock. Your needs vary, but late-night drilling is unlikely to repair a fundamental preparation gap.

One short warm-up, a review of your personal stories and checking the logistics can be enough. A difficult new case just before bed can create unnecessary anxiety.

Set a stopping time, check the interview link and materials, and prioritize sleep. Use last-minute case interview preparation for a short final review, but leave demanding mock cases for earlier in the week.

I once crammed three full cases the evening before. Was exhausted by the actual interview, never again.

A five-minute mental maths warm-up feels different from another full mock. I'd probably still do that.

I spent the last hour testing the camera, finding my notes and getting off my laptop. That helped more than drilling.

Counterpoint: if I don't review my opening fit story once, I'll spend the night worrying about it. One run-through is enough for me.