Those who dropped out were for a few reasons. One dropped out after 2 weeks because she was homesick. She transferred to a local uni so she could live at home. Two or three hated the course and preferred to transfer unis to do a similar course rather than swap to a different one at Warwick. A couple struggled with making friends and were lonely. This happened to to one girl who was in a kitchen of 4 and didn't gel with the other 3. Another girl had stuck with her school friend and when the school friend dropped out found that she hadn't made any friends of her own. One lad stuck out the whole first year then transferred back to his home country.
None of them dropped out of uni completely though some decided to take a gap year and apply again. Warwick does attract fairly high achieving students so ones who would probably have been in the top 10% or so in the past. I think that now they are paying for the privilege they won't put up with a mediocre experience and are more willing to make sure they feel they are getting their money's worth, maybe?
DS1 chose a very basic room with lots sharing a kitchen. This was for financial reasons but socially it worked out really well. Lots of people to meet up with in the kitchen, bound to be some you get on with. Also, for him, they were from similar backgrounds as had all chosen low cost accommodation and were almost entirely from state schools. I don't know if that was a factor in making friends, but can't have hurt. DS1 wasn't the most sociable lad at school but he's had a great time at uni with lots of like minded people.
I guess I'm saying be careful with choosing accommodation, kitchens of 4 sound great but are usually more expensive and can be quite lonely. Even sharing bathrooms gives opportunities to muck in and gel with your fellow students.