If it's one thing your DS should remember is to keep his feet and knees together. If he can be the first out the door of his stick, then that's the best position to be. Finally, tell your son to always look at the horizon when he's at the door. Don't look down. It's scary what he might see.
Graduation date is fluid. It depends on when the class can complete all 5 jumps. They always do 1 jump on the first day. Then after that, it's based on aircraft availability and weather. Let's say, for example, they have 1 jump on Monday, 2 jumps on Tuesday, and 2 jumps on Wednesday. Graduation will be after the last jump on Wednesday or even Thursday or Friday. If weather is bad on Wednesday, then they will try to get the last 2 jumps on Thursday and then graduate them after that. If weather is bad on Monday and Tuesday, then they will try to get all the jumps in on Wednesday through Friday and graduate them as soon as the last jump is done.