You have to test yourself as much as possible. Find the most competitive games in your area and play. Find out where the players on the college closest to you play and pick up a run. The only way you're going to know how good you are is to measure yourself against quality players. That's your first step. That'll tell you what the next step should be. Basketball on the college level is a step up from real good pick up and division 1 ball is serious. Whatever skill you don't do well is the one you need to work on the most.

Good luck!