Um, I haven't heard of anyone being put in a fully fledged simulator with no prior experience or knowledge of flying whatsoever as part of an application.
I would imagine it's a mistake to be honest, unless they're going to set you up on an extremely basic scenario to test initial aptitude, with someone else doing most of the actual flying.
Although I wouldn't see the value in that considering the cost.
Just go along and have a go at whatever they give you, I wouldn't worry though, they won't be expecting much if you have no experience.