first off, i'm sure it'll all work out, no matter what. you can do re-sits, college - my point is, you're never doomed, and there's always a way to fix everything.
i'm not sure about your sixth form, but we need grade 6 minimum for mine. the world isn't over, you could probably still get you're required grades if you got them in the mocks. in my experience, people like to say they did well in exams that actually went sh*t. also, the exams aren't over yet. personally, if i were you, i'd work ridiculously hard these next two weeks (make sure to eat and sleep and take care of yourself too!), and try to smash these last few exams. if you need any help with anything, just message me and i'd be happy to!
try not to stress yourself out about it too much. people will always support you, and there's always a way to fix things if for some reason they don't work out.
i believe in you, you've got this, good luck!!