Is it possible to go from good to national qualifier in one year?

I'm a good (best within my school), top 5 in my county, type runner. I just finished Cross Country and after watching NXN yesterday, I'm wondering whether there is any chance that in the next year, I can improve myself enough to qualify for a national meet. I'm from the northeast if that helps; as far as I know we are one of the less competitive individual qualifying areas. Our summer training plan includes about 500 miles of running, a little more actually. I heard Arcadia does 1000 a summer. What kind of summer training is best? We include a workout or tempo every week, should the summer not have speed at all? What do I need to do?