You are the exact reason why you shouldn't disobey your parents.
Yes because I choose to be different and choose to actually think for myself rather then ALWAYS listen to imperfect humans like myself, but moving on...
On topic: Eh, if you want to do any of those things, then go for it. As for the girl issue, I still say go for it. There are numbers of ways to go about it, I don't fully agree with the sneaking behind your mom's back... Vertical did make a good point but at the same time you can't just let your mom control every aspect of your life.
If your mom is reasonable (which given how you described her reaction to your intentionally trying to fail, I doubt it) then try to convince her to let you give it a shot. Though if she is stubborn, then it will backfire and ruin your chances even more... kind of a lose lose situation.