Originally Posted by rufus_smith
I wouldn't be surprised that just by losing 30lbs by itself will double your stamina
Losing the weight will help, but not solve the problem. You'll have to strengthen your leg and core muscle groups so they don't wear out so quickly, and improve your cardiovascular system. Hydration and proper breathing techniques are also crucial for endurance on the court, so take a look at these as well.
I think the exercises he gave you are a good start. Look into some intense interval training routines as well. These will also help to lose the extra weight.