One thing your son might consider as it gets closer to school starting. If his battalion has not sent him a 104R form before the start of school look online, you can find them through different websites. Tell your son to start looking at classes for his major, contact his advisor and start putting together the 104R. This form can take a bit of planning, don't worry about whether he will stick exactly to the plan, it's more of a living document that can be updated as he progresses through school. Cadet Command just wants to see a written plan that shows he can graduate in 4 years. If your son is in an engineering program have him talk to the carde about a 4.5 or longer plan if needed, this will need approval.
Having this form completed, or close to it, will be a big help in being able to contract early in the semester depending on when the battalion gives him his first APFT.
Your son should keep in contact with the battalion ROO or HR person over the summer to try and get as much of the paperwork sent so he can get a jump on it.
And of course do what Sheriff3 said, run a lot and work out.
