When I applied to consulting, I was lucky enough to have friends working in MBBs to coach me. Their approach was very useful for me. I would like to help you using the same approach: master market sizing using different frameworks, understanding how to break the problem statement into formulas then walking through the assumptions and the needed input. As I've coached my candidates already in Business School and while I was a consultant, I know the pitfalls and tricks of interviewers!