It's easier to go to uni now you only need E s at A level.There for they ain't that clever.Most young people to uni for the social life and travelling after
I don't know of any course you need E at a level to gain entrance to a degree. Yes some of the old polys have lower entrance requirements. My daughter needed 3 As, as did her cohorts.
However I don't think it's relevant to who enters the villa. Rosie for example was a solicitor, which takes years of hard graft, and yes you need to be clever, but look how she behaved, arguably one of the worst in there.