I had two rounds of interview. The first one was with two senior managers back to back, each for 30 minutes. The questions were all behavior so you have to briefly answer with examples. After around two weeks, I was invited via email to an on-site interview. I interviewed with a senior manager and a partner, which took an hour in total. Then the recruiter called me a month later with an offer, following by an official offer two days later. I've also interviewed with another Big Four before and I notice that each interviewer's style really varies. But there are things in common as well. My suggestion for interview is that you should prepare at least ten questions that you can ask the interviewers, not only to keep the conversation going but also to have something ask if the interviewer leaves 20 mins for Q&A(which happened to me once). But do prepare tons of stories that you can present. Also keep in mind that they want to see the real you and decide if you are easy to work with. So I would suggest to be confident and yourself.

It was an on campus placement interview, they mostly asked about my CV and personal achievements. Some questions were regarding basics of accounting like principles of accounting and treatment of depreciation and other items in all 3 statements.