So cool! Sussex is rly good and I always hear how people got lower than their required grade boundaries and still got in the uni. Don't worry at all, they [Sussex] obviously accepted you because you're capable of this (as well as them wanting coin ). Revise revise revise!
Good luck for your exams!

And I wanna go Essex and they want BBBB. (I'm doing an EPQ).
I got a B for my EPQ, and a B for my Film Coursework (I do Film, Psychology and English) but I'm rly worried about psychology and English. Mind you, I got BCU for my A Level results and Essex is still considering me so you'll do amazing.