Best Sixth Forms/Collages in London (centrally preffered)? websites?

UI have been uselessly searching google for good sixth forms and such but till now not having any luck.
If possible could anyone point me towards a good sixth form/collage or a website that can list the best ones in order or just all the sixth forms in a bourough ect?

Im an academic person so subjects such as English Lit and History are essential. SO if theres one that specialises in these then its a big PLUS!

Thanks!

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