You have to complete a behavioural interview then a case interview. The case interview is the hardest part, they give you a scenario and you have to solve the case as if you were an Oliver Wyman consultant. Its usually in the interviewee led format and you ask the interviewer a series of questions to lead to your answer.

Primo colloquio con presentazione personale (CV), domanda sul perché vorresti fare consulenza e perché fare parte di Oliver Wyman. Poi risoluzione breve business case: "Quanti progetti di consulenza vengono condotti in un anno in Italia?"