Case + Excel, you get some time to work on the spreadsheet before the interviewer joins and asks about your findings while you share screen and present the case on the spot. Time limit is around 30 mins

Case studies Candidates are presented with a business scenario and asked to walk the interviewer through their thought process. Interviewers may ask questions about how candidates approach unstructured challenges, evaluate data, and communicate their ideas. Behavioral and fit questions Interviewers may ask questions about a candidate's accomplishments, experiences, interests, and career goals. They may also ask about a candidate's motivation for applying to Oliver Wyman and how they fit with the firm's culture. Situational judgment Interviewers may ask questions about how a candidate would handle a situation, such as disagreeing with a project manager's approach.