A level choices

I’m in year 11 and for a levels I want to do Geography Chemistry and French. I want to do chemistry or environmental sciences at university and I’m predicted 9 for geo and I haven’t got the actual grades for the mocks for chemistry or French but I’m looking at grade 8s I think for them right now. I’m also struggling to find deep info about sixth forms about the courses and was wondering if anyone had advice for finding out things about them. So far my options for sixth form are the grey coat hospital, morpeth sixth form or the Camden school for girls and was wondering if anyone knew other good schools in or Near East london.