Justin,
I am by no means an expert in the field, but I can provide you with what I do on a weekly basis in prep for A&S. First, is your diet. Personally I prefer to stick to as close to Paleo as I can. (If you would like more information on that just hit me up). As for exercises, I do a combination of different things.
Mornings:
Mon, Wed, Fri mornings: I run a full PFT before doing group PT. (Being that I am stationed in MA, the flight line will sometimes see single digit temps so I have to stick to the treadmill).
Mon-Fri mornings: Group PT (usually consists of 5v5 basketball, weight lifting circuits, or some sort of crossfit).
Afternoons:
Tues&Thursday afternoons: My SNCOIC and myself go to the pool and do speed swims (anywhere from 300-1000m swims, in cammies for time).
Mon, Wed, Fri afternoons: Some sort of speed work (sprints). I generally alternate each week between boots&utes/pt gear.
Saturdays: LONG ruck/swim/ruck or run/swim/run. Fortunately for me, the pool I go to is exactly 3 miles from my house so I throw on some old school cammies, a mountain ruck, and take off. To extend past 6 miles I pass up the pool by 2 miles, then do the same on my route back for a total of 10 miles.
Sunday: Rest/Recover
Evenings:
Mon-Thur evenings: My wife and I do crossfit at our gym, we'll usually do the Spartan WOD, or something I cook up at work.
Hopefully I haven't confused you too bad with that, basically it comes down to being extremely active about 3 times a day. It seems like a lot but I honestly can say I have yet to feel any real discomforts (aside from the normal soreness). I'm 5'11" and weigh 187. When I used to lift a lot I was up to 196 but I can honestly say I feel stronger now than I did at that time, just minus some mass. If you don't feel ready for A&S, why not just request to hold off until the Aug/Sept class?
Hope this helped,
Josh