Case studies/guesstimates were asked and also some questions based on the personal experience that you have had in the past along with some technical questions as well, overall 3 rounds
Case Study based interview - interactive and you have to keep asking questions to get forward. Practice before hand would be helpful especially for first timers (should go through previous cases adn their style of interviewing).
Interview questions [1]
Question 1
Increase sales of a company that plans to grow in the future
Good, it was a recruiter call for BCG X and there were basic questions but did not exactly know why I was rejected, she asked about my background, skills and sponsorship