You shouldn't be doing tempos in June and July. Your racing for November, right? Now is the time to slam home some big miles. Your first tempo shouldn't be until early September. Do hard runs below tempo pace starting in August (2 per week, known as sub-threshold runs). Throughout June and July, all you should be doing is 4-6 X 10-15 second strides 3 times per week along with those miles. Got to run those miles. For an incoming freshman, you should get to 60 by August. Be comfortable running 70 miles/week with two sub-threshold runs by the time you get to pre-season in late August. Then the challenge will be holding 70 mile weeks as you mix in hard workouts.
And whatever you ran in high school from the point you graduate is 100% irrelevant, whether the times were good or pedestrian. Collegiate running is about who runs the most miles from June-October and who best takes care of their body and mind. What you ran in high school has nothing to do with those two things so from this point forward, forget all your PR's because they don't mean shit.