I prepared a couple of candidates for interview with Advancy Paris (which then ended up accepting an offer at MBB).
Process is at follows:
Normally 3 rounds interviews, one with HR (could be phone interview), two with consultants and final one with partners.
Structure of interview is similar to MBB in the sense that is FIT+Case - 45 mins long.
Let me know if you have further question and good luck with the interivews!