Really worried about GCSE results day

Hi guys, only 3 more days ro go and I cant stop thinking about it. I've tried numerous different things I'd usually find enjoyable but none of them are distracting me from the inevitable.

I want to go on to do a levels in English lit, geography and history, but my sixth form said that I require a minimum of a grade B in english language, and although I recieved this in the mock, I do not think I was so lucky in the actual exam. Also, my geography did not go to well. My coursework was an A* and the sdme went ok, but my main exam I messed up on and I ned a b overall. NOT GONNA HAPPEN!

Also, my maths teacher left in Novemeber and we were stuck with HLTA's and had to self teach each other. It is for this reason that I think I got a D in maths.

What do I do? My sixth form will not let me do my course if I dont get the grades and I cant stop thinkin about it, and believe me I've tried!