M&A Associate applicants have rated the interview process at Deloitte with 4 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 75% positive. This is according to Glassdoor user ratings.
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It was good. Finance ques followed by case study and guesstimates. Plus basic HR questions. There were 2 rounds. 1st was with Team Lead and second with HR. You can prepare with basic financial modelling.