I can't speak for Fry, but I know this is the answer for me: Maturity, maturity, maturity. There has been a lot of growth for me this past year. Also, college level work is a much heavier load than HS work. I took a lot of APs too and was still overwhelmed with the load here from time to time.
As for what I'd do differently... I don't really think there is much I could have done. Maybe studied a little harder. Practiced tennis more. But both Fry and I were QNS, and last year was very tough. Basically, if I'd had the opportunity for direct appointment, I wouldn't have said "No, thanks, I'll take prep!", but I believe that there is a lot of value in a prep year if that is an option you are given.