Need Help on Dunking?

So I am in 8th grade, 6 foot 1, 190 pounds. My AAU team is going to nationals in Orlando in a month and a half. Right now, I can get rim. Occasionally, I can finger roll and grab it. I have started leg workouts to help my vertical. Is there any quick solution to help me dunk by nationals? It can be technique, more workouts, or both. Thanks!