Ham's advice is very good its not a proficent 747 operator they are looking for, its the normal things: Teamwork, crm, capacity, airmanship etc and of course do the flying skills match the CV and is there an improvemen on the day.
I was told by a recruiter that the 747 sim is used as a " skills leveling tool" in much the same way the 1-11 sim was, as it is now the type most of the candidates are unlikely to have experience on..