Sup guys. Just wanted to ask, as a 14 year old, jumping 30 inches. How long does it take to make myself jump 35+ inches. Btw, I'm a beginner. Never really trained before. Also, give me tips on jumping and the process of dunking. I can't even dunk in a low rim bc my technique is terrible. Tysm guys.

What should I do to have more stamina ? Drills?