Revising!!!!!!!!!!!!!!!!!!!!!!…

I am having my science GCSE on 16th June 2010!! And I am in year 9!!! They are bringing them forward!!! It's so annoying!!! Anyway, I use bbc bitesize, and I have revision guides, and books, past papers I have done. And I have done mochs. My target is a C, ( I am doing foundation) anyway, in my mochs I got one E and a D. And I was 12 marks off getting a C!!! I am asking what are some really good ways to help me revise, like what sort of foods are good too eat before a exam??? And any relaxation movements or something. I am going to go shopping, on day this week (since it's half-term) (I am from the UK) and get some more books. And stuff and get a scientific calculator, and a big pack of black pens and pencils. (loads of stionary) So what would help to revise???