Where can I study music a level in London?

I was wondering if someone who studied music a level or knows the best place could tell me where is the best place to study a level music in London. I play Grade 6 piano and Grade 4 flute. I've got a long list of schools but I want to narrow it down to the best places.

I’m sure majority of secondary schools and sixth form colleges do. Obviously I’ve never heard you play before but I’m not sure if you’re at the level yet to be accepted into a specialist music college. No harm in auditioning though!

Sorry if this is this a stupid question but when you say specialist do you mean colleges that only offer music or focus on that?