im 16 and i have been out of competitive play for about 5 months due to an injury. now im back and i have been selected to play in a team where everyone is older than me and most of the have high school scolarships and i have a chance to get one myself. so please recommend some excersices and drills to improve stamina, speed, and defense!! Thanks 
For stamina I reccomend running/jogging around your neigborehood or track field for about 25-45 minutes about 3 times a week.
I have a drill for speed.Stand on one side of the free throw line,run to the other side of it touch,run back and do the same.Repeat this about 20-25 times or you can time yourself and see how many you can do in say about one minute.Do this about 2-3 times a week.
Conditioning-I just reccomend running/jogging and some upper and lower body workouts.Pushups work well and so do squats for your legs,as well as calf raises.Calf raises will also increase your vert.
And I do reccomend you work on your shooting and do work on the fundamentals as you haven't played for a while with an injury.
I hope that helps.
~Good Luck 
~~
