Make him shoot from a tree and give him a test. Move a target around and make him hit a three inch dot between 15 and 30 yards. He can't hunt until he hits it and put some pressure on him. If he waits til a week before season he probably won't have any arrows left at the end of the test. It will be obvious he is not ready.
Next year, Once he passes the shooting skills test find him a spot way away from your spots. Don't share your camera pictures, it just breeds jealousy.