Monroe Institute has a recording called "Buy the Numbers" which I can recommend. This can help bypass whatever is preventing you from enjoying work with numbers. It is a surprisingly effective tape.
Belief paraliminal- because you *think* you are terrible at test taking
If you have Natural Brilliance, it would be a good idea to do that one too...
Most of all, trust yourself. Go through and answer all the questions you know, leaving the others for later. After going through the whole test, go back to the ones you skipped and solve them. Dont second guess yourself- usualy the first response is the correct one. Trust the power of your unconsious mind!
good luck
vitaman