I have received offers from all of McKinsey, Bain and BCG so can talk to the case interview process at all those. I have also helped design cases used in real interviews at Bain so I know exactly what is being evaluated and what the bar is.
We will run through an example case study (similar to the ones we use in real life) and you will receive detailed feedback on all aspects of your performance, from structuring and approach, to style to body language. I tend to be quite straightforward in the feedback I give, but candidates value it and often refer to it as an eye-opener.
Right now I'm applying concepts learned in consulting to real-life problems, working as a Product Manager at a unicorn startup.