The recruiters for the most part are really friends. Had two rounds over the phone and these cases focused on the division I was pursuing. Mostly pricing or strategy improvement. The super day was in office at Cambridge with 3 case interviews (at least 1 partner and then most people had at least senior consultant ranking for the other two). You also have a math exam and lunch interview.The senior consultant as mentioned here previously makes you do a simple excel exercise. The math exam is essentially GRE word problems in which if xyz happens, what happens to the variable. It is hard if you do not know what type of questions to expect. In office, 2 of the interviewers were cold and didn't seem too enthusiastic to be helping with recruiting.