I have consulted many people who are long-time runners, marathon runners, etc. And one of the top things they all tell me is to avoid running in a way where you can injure yourself. When I first started training I ran 4 days straight at maximum effort and ended up busting up my knee. I lost a month of running training because of that. I don't know what your fitness level is, but 2 miles a day 7 days a week definitely sounds like injury territory from my (rather unrefined) lenses.
15:30 is already pretty good, and actually better than where I'm at. One of the things I've been suggested is doing "trials" at a track at the pace or slightly faster than the pace you want to be at for the PRT. For example, go to a track and run 20 intervals at a 8 min/mile pace with a short rest in between them, making sure you properly warm up beforehand. Then another day you can jog 3-5 miles as distance also affects your speed. If you're used to running 3 miles then 1.5 will be like nothing. But ALWAYS make sure you properly rest your legs before training as an injury will be the difference between being able to run and not.
If anything, once you finally get into the program and take the PRT you can give everyone here the definitive answer as to what happens in regards to the PRT as there's like 4 different answers floating around.