I am an ex McKinsey targeting to transform your way of thinking - beyond the cases. In our classes I rely on the famous problem-solving books such as Bulletproof Problem-Solving to make sure that you not only shine in the case interviews as a top-notch consultant would but also think like one - once in your dream-role at MBB. My approach also helps to do much of self-practice and avoid souding like a guy who did 100+ cases.