My fear of tests...

I hate tests... i absolutely hate them... First it was school exams... after getting through that i now have to face a driving test... just the thought of this makes me so nervous i drive like an absolute amateur... nothing seems to help.... even the easy questions i know the answers to seem like the hardest things in the world... what is it about tests that makes me fear them so much... everyone says its just a test... but thats just it... to me its the difference between success and failure... I hate failing... but then again failure sometimes teaches you invaluable lessons... so why does it freak me out to the point where i nearly kill some poor person... So i just say to myself... get it over and done with... you will pass at some point... surely it cant be that bad... can it?