I think, as far as I could figure out, that those points (up to 10 if you count the adversity as having two possible points) translate roughly to a percentage figure. But they were so vague about it, I can't be sure.
I don't know what gold crest is, sorry.
Voluntary work experience counts. Mine was a week full-time shadowing consultant anaesthetists and then working for the Red Cross first aid team and the emergency response team. The longer term you've been doing something like that, the better. Basically, the two weeks full time thing is saying that they want you to have done around 80 hours of work experience before applying.
Don't even worry about the role play thing - it's just part of the interview and you can deal with that if you get an interview. It's really not that bad at all - they just want to see you interact with people.
They interviewed about 450-500 this year out of >1500 applicants. Supposedly around 300 of those will end up getting offers for the 146 places.