1. Running. At least once a week throw in runs to improve your 2 mile speed. You want to do long sprints. I can’t emphasize this enough. The only way to get faster running is to run faster. The 2 mile run is not a long run but a long sprint.
If there is a track nearby, 1/2 lap, rest; 1 lap, rest; 2 laps, rest; 3 laps, rest; then work down. If no track, then use a block in your neighborhood. That will be close enough.
Do fartleks. That is where you go for a long run but intersperse sprints. Warm up for about 5 minutes. Then sprint for a set amount, rest for twice the amount. It can be a time- say sprint for 30 seconds, jog for 1 minutes. Or sprint for 2 light poles, jog for 4 light poles.
If there are hills nearby do hills. West Point is a fjord so there are few flat areas. The PT test is given on the long flat road on the Hudson. Do hill by sprinting a set distance, then walk down to your starting point.
2. Ruck marching. Don’t prepare for this by doing a bunch of rucking. It pounds your body. Maybe do 1 or 2 to get use to it. Get a rugged bag and throw some weight in it. Not too much- maybe 20 lbs to start. Make sure you wrap weights in a towel or something so they do hurt your back.
The best way to train for rucking is to hit the weight room and do some core weight training. Leg presses, squats, etc. You’re probably ok in this respect due to your rowing, but it doesn’t hurt to strengthen these areas. And I’d I mention there are hills at West Point? The ruck up Victor Constant has made tough Cadets cry.
Others were spot on for push ups, pull ups, and sit ups.
Remember to enjoy yourself as well in this time you have left. But yeah, being physically fit at the beginning helps.