You start with verbal and numerical reasoning tests, which are full of fairly easy questions but are made difficult by negative marking (+1 for right answer, -1 for wrong answer) and time pressure (30 questions in 20 minutes). Be sure to practice some of the verbal reasoning tests in particular; this really helps improve your speed. About 80-90% are apparently cut after they look at combined test scores and CVs. The rest move on to a final interview day, with four one-on-one interviews. Three of these are case study interviews, while one is CV-focused - prepare the usual questions for the CV interview, for the case studies I'd again take a look at practice materials on the web but there's only so much you can do to improve your innate ability in this area. All the interviewers were very friendly, and gave the impression that 'fit' with the firm was very important to them when making selections. For the general management consultancy track there is also a group exercise.

The interviewer was extremely nice and made me feel comfortable throughout the whole interview. The questions asked were half behavioral and the other was a fermi based question. Because this was for an internship, the whole interview process was 15 minutes.