Imo, go to any school you want. I go to a crap school in West London and I managed AAAB at AS while a few of my classmates went to grammar schools in slough and a few went to st doms and got B's
One girl got 10 A*'s and 1 A at GCSE, went to st Doms, got AABB.
I got 1 A* 8A's 1B and got AAAB in Maths, Fmaths, Physics and Eco.
Proof it doesn't matter where you go. The ****ter it is, the more independent you'll have to be thus the more ready you are for uni!
Go to one where your mates are going or is closest to you. Commuting is long too
PS: I go to Harlington School in West London