PwC management consulting intern case interview

Asking for a friend who has a 2-hr interview set up for a management consulting internship position at PwC. The 2-hour slot consists of case prep/instruction (60 minutes), case interview (30 minutes), and behavioral interview (30 minutes). Would anyone have any insight into what he should expect? Anyone have experience with doing a case study for PwC? What goes into the 60 minute prep session? Thanks in advance.