I would also add to make sure you run in every type of weather, the fact that it wasn't an ideal weather day means nothing when you take the PFT in AFROTC. They schedule the day in advance and they don't refer to the 7 day forecast to determine it; unless it is a hurricane or blizzard.
Our DS when at home ran in the worst weather, never the best weather. He would run at 4 in the afternoon (hottest part of the day), he ran in rain, he ran when it was 20 degrees, and he would also get up at 5 a.m. after going to bed at 1 to run. The reason why is he was trying to mimic every type of condition that he would go through at the det. He always wanted nothing less than a 10:30 1 1/2 mile run.
The thing to realize is when you do the run, there will be PT instructors leading the pace, and those in the back shouting out last names for the ones that are not fast enough. This is not the way you want them to know your name as a C100.
Additionally, there is one reason, at least at our DS's det. when he was there to get your time down, and form correct. Some dets allow cadets that max the PFT to be excused from mandatory PT...it is done on trust that you will continue to work out on your own instead of showing up at 6 a.m.
This is can be a double edge sword, because the next semester they most likely will make you a PT instructor which means you will be showing up at 5:30 a.m.
Finally, although the PFA is a small portion of the WCS compared to your PAR, every point matters when it comes to a scholarship. AFROTC boards are going to award points to each applicant and a line will be drawn, above you get a scholarship, below you don't.
Good luck.