I'm trying to become a mixed martial artists. right now i learn boxing for $125, my parents don't want me to learn BJJ and boxing at the same time because they said I have to study and the price is expensive especially since we're moving in 1 month and have to pay for my sisters college fee. I'm 15 right now, and I'm trying to find a job to support my parents. I don't plan on going to college and get stuck in financial crisis. So when should i start?