How do you get into the Royal Ballet School?

I am 13 and I desperately want to get into the Royal Ballet School, I am really eager and I practice or do Pilate's for 30 minutes every day but I'm not sure if I am too late or if I am practicing the right things and if I'm practicing well. I am also not sure if I need to eat specific things and whatnot, So basically please can I just have some overall guidance to how I can achieve my dream of getting into the Royal Ballet School? (sorry for the cheesiness!)