How can I convince my mom?

If your mom is not agreeing, then persuade your dad, sister, brother, aunt, uncle anyone to stand by you in front of your mother.... cry, beg, plead but just go, don't miss such a great chance..... and you know mom's are very emotional... so a good option is find out if she could not do something in childhood because her parents did not allow her.... if you get something like that, then emotionally persuade her taking that example... or right her a nice emotional letter about how much want to go and how you'll regret all your life that you could not do what you really wished too...