They are really looking for consistency. I had four parts to complete in the AC which were a group exercise, a presentation (you get the topic 1 week prior to the AC), an interview, and a case study. One cannot really prepare for 1,2, and 4 but you really have to nail the presentation and know everything about what you are talking. I put in less effort and didnt get the job only because of that even though they told me that I outperformed the rest in 2 and 4 by far.