Minor faults lead to bad accidents. No one is a perfect driver, but failing 9 times puts you in a very low catagory and suggests you make a lot of mistakes.
Bad nerves are not an excuse, if you suffer bad nerves under test situations how will you cope in snow, rain, traffic etc etc not to mention when you are stressed about work or a boyfriend or whatever? Bad nerves are not an excuse for failing, they are just another reason as to why certain people shouldn't drive.