london sixth form schools & colleges - the top 15 and worst 15??

As I'm in year 11 I want to know the best colleges/sixth form who have the best grade or teaching
I am hoping to take as my a levels
flim studies
english language and literature
sociology
geography or government and politics

State or Private? And where? How do you define "Best"? If it's by results, you can find out the top performing sixth forms using the league tables. One thing to bear in mind is that high performing sixth forms probably won't offer film studies.