I want to say the following regarding the final rounds, since I have broad experience in preparing candidates specifically to the final round,
•. Final round is about 'depth' and not about 'breadth'. Initial round interviews are broad. Several fit questions, cases with multiple analysis etc. Because the intention is to test the candiate on as many aspects as the interviewer can. Final round is different. It is about testing the depth. Partners typically ask very few quetions but probe every answer to a great depth.
• Candidate needs thorough preparation to tackle 'why-how-translatability' probing questions by partners. Candidates need to be ready to justify their answer in a consulting compliant way.
• Final round is 'unpredictbale'. Final round interviewers, Partners, are known to throw curve balls. There have been interviews where Partners have just taken fit questions and business discussion, on the other hand there have been interviews where Partners have given detailed cases to the candidates. You never know what Partners can pull out of their hat.
Candidates need to be extra prepared. Especially, for question formats that they have not encountered in earlier rounds viz. Partner converting project from candidate's CV into a case, partner starting discusion on recent business event, advice seeking on business issue that the Partner says he is facing. Through all these variety of discussions, Partners try and test the candidature thoroughly.
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