Hey,
You aren't allowed to use anything except the pencil that they give you, a couple of pieces of paper and the old grey matter, no outside help!!
You won't have enough time to get most of them finished, especially the maths. Don't worry about getting finished, get the ones you have time to do right, work as quick as you can but be ACCURATE! I went down the library and got a couple of books out and just worked through them over and over, you get used to answering them and you'll get quicker and quicker.
Just relax and do what you can and you'll be fine! Good Luck!!
Cheers