Case Study . They will first present you with some general question, and then will test your ability to solve this general question. I think it's the thinking process they are looking for. Afterwards, they will ask you questions like why you want to work as a consultant? After these questions, they will present you with a case study. A typical case study. In the end, there is a technical interview. It's better to practice some exercises related to excel before the technical interview.

I had to fill out a 2-page questionnaire about my experience with data, followed by a phone interview with 2 consultants. They were both very nice and willing to help. The interview ended with a market sizing question, with then some minutes to ask questions (if any).