in HR they really wanted to see your love for the company, and why you chose them, 'tell us about yourself'.
For business interview: a lot of experience questions (also for graduate students) about challenges, weaknesses, strengths, deadlines, conflicting tasks, something you're proud of, why KPMG, why advisory, and why this exact branch.
Be prepared to have 1 Q in english and 1Q in the other language: Dutch/French
If you prepare your knowledge about the company, show interest, and know basic interview questions you will be fine. they expect you to LOVE the firm, and have very clear reasons for applying there (not just BS ones)