The very first is online test in which there are every tyoe of question quants guessestimates verbal reasoning etc then second round is coding round in which we were asked some sql question 2 -3 sql queries and one dsa question next was interview round in which i was asked some puzzles guessestimate in which you dnt have to perform some calculations you just have to tell the approach then some sql queries and questions and some questions about ZS

Applied with 2 referrals. 30 min quick phone screening. Second round Python and SQL OA. Third round unstructured case study and SQL questions. Final round includes a 1 hour structured case study and 45 min behavioral. Case studies do not require much prep in my opinion and are very conceptual. However, your interviewer does matter. As a native English speaker, I had a very hard time understanding my final case study interviewer and believe my clarifying questions might've been the rejection.