Serenity
Regarding an Academy application, I have a few tips.
1. Don't give up. I got accepted the second year I applied. Keep applying until they tell you you're too old.
2. Pad your application with everything you can. Get into school council, join a club or two that have something to do with athletics, leadership, engineering, or flying. Even better is if you take any kind of leadership role in the clubs, but membership is better than nothing.
3. Do sports. As much as possible. Lettering is best but participation is better than nothing.
4. Work on that run. I guarantee you that if you get accepted, you will appreciate every second you spent preparing for the run. Imagine the runs you're doing now, but at 7,000 ft altitude carrying field gear in the rain with instructors "encouraging" you to not be the weak link...
5. Test and test again. Take the SAT and ACT tests until you're no longer eligible, to get the highest possible score.
6. If you get passed up, don't enlist. Instead, go to college and re-apply, adding your college courses to your application. Any college will do. I screwed up my State University applications and ended up having to go to a local community college for a year, but the Academy admissions process didn't hold that against me. It helped that I swam at the intercollegiate level...
7. Did I mention sports? Getting blue-chipped as an athlete is a great way to boost your entrance application score. And you really need to be in good shape because running at altitude sucks until your body adjusts.
8. Your interaction with your congressman and his/her staff is for the sole purpose of convincing them that you are not only the best candidate, but are also going to graduate and serve in the military. If you get the congressman's selection group behind your application, you can really boost your chances of getting in.
If you want to better prepare for the 1.5 mile run, you should always run farther than the test length. A 1.5 mile fitness test at altitude "feels" about like a 2 to 2.5 mile run at sea level, so when doing practice tests, try to run at least 2 miles as if you're running the shorter test.