I've just read someone asking that if you don't like your score in the test that you took years ago, can't you just create a new account at mba.com and start your record fresh??
This way, you could create as many accounts as you wish (given the fact that there are people with identical names in the world) and fool the adcom by making it appear as if you got 700+ on your first shot.
I've never taken the actual thing yet so I don't know if test regulators take certain measures to prevent this (i.e. take down your SSN or something..) at the test site.
I just hope GMAC knows about this and has measures to prevent such cheating from happening.