swervin'mervin is right. Take a good look and you'll see there are only x number of questions they can really ask. The numbers may change but the questions are essentially the same. Practise these until you understand them and can work them back to front side to side forwards and backwards and up and down.
I used Bristol's feedback database to practise all the different kinds of questions and made sure I was a whizz with the whizzwheel (love saying that!) and it turned out fine first time around.
Good luck, you'll be fine.