MD How do I improve my application?

Hi all,

I applied to an early assurance 7 year program as a sophomore undergraduate, and got my rejection letter today. :( They accept around 10%< of the applicants which is much higher than most medical schools, yet I still didn't get in. I'm just confused as to why I may not have gotten in...So I just wanted your advices on how to significantly improve my application for the upcoming 2014 cycle I will be applying as a junior. I have one year to really make this work. What can I do to increase my chances? Any help would be really appreciated. Thanks

sGPA: 3.7 (aiming for 3.8 by the end of junior year)
cGPA:3.81 (aiming for high 3.8 or low 3.9 by next year)
Haven't taken MCAT yet.

Hospital volunteering 1 summer+1semester ~80 hrs
Shadowing: cardiologist and internal residents.1 semester
Research 1 summer+1 year. ~500+ hrs
A few campus club member. Leadership position in one of them
Helped out at yearly National service events.