Best of luck with your results!
In regard to Stage 2, it's probably true - you can't really prepare for it to any great extent. However, practicing basic arithmetic doesn't hurt. Also have a go at playing some reaction speed computer games. Many of the tests involve sorting shapes/colours into different categories based on certain 'rules'.
Try this game for a bit of fun:
DACHSER Global Player Reloaded
Also, see:
FEAST test - Wikipedia, the free encyclopedia for further info on the FEAST.
By far the best piece of advice I can give is to get proper rest the day before and to then get a decent night's sleep.
