I think you need to find somewhere you can study where you won't get disturbed and where you're comforfortable. Some may prefer total silence, but unobtrusive music (in other words not loud thrashy booming stuff) may help too. When I was at school, much of my revision was done to the sound of three albums - Autobahn by Kraftwerk, and Magnetic Fields and Oxygene by Jean Michelle Jarre.
One thing that was really helpful, particularly in things like history where there are a lot of facts to learn, was to go through the work I'd done through the years in my handwritten books, and note down on sheets of paper the most important bits and facts. I found that in the actual exams themselves I'd picture the words on my notes which would help in remembering the facts. Differing your layout on the notes can probably help here too - things like underlines, indented paragraphs, summarised lists etc. All of these look different on the page so your memory may be helped by picturing how different layouts looked.
The old advice of using mnemonics for lists of facts does help too. Like "Never Eat Shredded Wheat" for the points of the compass in clockwise direction: N. E. S. W. (apologies to shredded wheat - I must say at this point that it's a wonderful breakfast cereal - delicious and healthy too).
Or make up rhymes for facts, like "Columbus sailed the ocean blue in 14 hundred and ninety two". It may sound silly but it works - and I've read memory theories that say the sillier the better!
With subjects like mathematics, where much is a question of understanding how to do things, practise answering questions to ensure you remember how to work things out.
Oh, and pleeeease, don't leave revision until the day before the exams. Do it steadly over an extended period of quite a few weeks before the exams so that by the time the night before any particular exam comes around, you have aready revised thoroughly and can use the night before to briefly go through all you've already revised in a reasonably relaxed way, and get a good night's sleep. You'll then be able to face the exams with knowledge that you've done a thorough job of learning everything.
).Then I've got this literature exam which basicly memorising what smart people have said during the years about the subject(you just can't beat the system!!).
.One essay in English, grammar stuff test and speech and understanding of English...only 3 more years(not counting this one)of hard work and I'll be able to go to a nice college(never got the spelling of this one though 
)somewhere in England or anywhere where they speak English 
i'm definitely one of those people who study right before, though. if i study more then two days before a test i forget everything!
