Pretty hard. First round consist of behaviorals and super day includes a case. Nothing too special but the math and real life feel made it a bit difficult. I would say this is the basic gist of it.

HR was based in London and had miscommunications with the consultants who were supposed to interview me. Was left hanging for close to an hour. When the consultants finally joined the interview meeting, they seemed to be in a bad mood. No professional etiquette