First off you can help yourself out by being familiar with numberwork. By which I mean do lots of mental arithmetic between now and OASC. I seem to remember the other thing that I was told to do was practise times tables of multiples of 6 ie. 6x, 12x, 18x. Apparently a lot of the questions revolve around multiples of 6?!?! Someone confirm if they can? The other thing that you can do is play computer games that will help you to practise hand-eye coordination. Of course they have to be a certain kind of game, I don't believe that playing Lemmings or Las Vegas strip poker will help much!