
I can give you a quick over view of what companies are looking for in case study interview rounds. To ensure we have the time to do a full mock case - reach out before hand on whatsapp to understand what companies looks for in case study rounds. Use that to prep and then we can do a mock case. I highly recommend doing this prep before doing a mock case round - my suggestions will be much more focussed and impactful that way.
PS: Had offers from McKinsey, BCG Gamma, Capital One, Meta and other analytics & consulting firm. I am most familiar with these interview processes but I find that they do apply to many other companies as well.