Where in London can you take year 12 resits?

I'm currently studying at a Richmond College in South London and I've just completed my AS exams (but these grades/exams do not count towards your overall A Level which I will receive next year - so I have to retake all of these exams in year 13 plus A2 exams due to the new A Levels).
My college have told us that there is a requirement of DDD to be accepted back next year plus good attendance (mine is 85%). I know for sure that I got 2 Ds but I'm unsure about my third D which is why I am beginning my search for a new college or sixth form that accept retakes just in case my grades are not DDD and worse comes to worst.
I'd really appreciate if anybody could name me a few colleges or sixth forms in London (preferably South) that accept year 12 retakes.
Thank you!

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