I have collected 70+ official cases done by consulting firms, with a focus on McKinsey, BCG and Bain and can pick one according to your needs of improvement (e.g., structure, calculations, market sizing, abstract concepts, problem solving, etc.). This helped me a lot during my preparation 4 years ago, concluded in receiving an offer from McK, Bain and 4 other consulting firms (did not try BCG).
I have been part of two seperate groups in the past 3 years in which I helped students prepare for cases AND improve their motivational speeches. In these years I have perfected an interview style that works for everyone.
When I do cases, I like to simulate them at 360 degrees, like an actual interview. I will start with some quick motivational questions, proceed with the case, ask for a final recommendation and finally give a point by point feedback with focus on actual examples or sentences said during the interview, in order for the candidate to better remember mistakes done.
I prefer following the same candidate through multiple cases in order to fix approach case by case and understand what are recurring mistakes and what are simple distractions (easier to solve).