When I joined there was no Sim assessment Phew !
others have posted details here though. If I remember correctly it was eng failure V1 /raw data dep/ single engine FD NPA (or ILS , can't remember) In the past there was some raw data (or at least non LNAV ) hold entries, which I am led to believe screwed a few people. If you trawl through all the recent NAS threads on here there is more info , as the above is just from memory.
The emphasis appears to be on good CRM / multi crew ops , obviously a good standard of handling, & familiarity with your bird. I have heard no horror stories & it appears if you perform to the level of a reasonable PC there should be no problems at that stage.