Many, many see fit as just 15 minutes of the full case. That is a dangerous myth. You are always being assessed for fit, even when the formal fit portion has ended. Provided you understand this, you will be fine in cases. Moreover, do not memorize answers. The main part of the fit is not the initial answer you provide, but the cross-examination which will follow, especially with McKinsey, and you can never be prepared for that.
