I have the 3.1 GPA (from Cornell. Let's go Red!) and a 37 MCAT (12V, 12P, 13B). I'm also nervous as hell this year since I was rejected across the board last year without interview. I spend every waking moment thinking about UMass (not to mention dreaming about them and Jessica Alba during non-waking moments) and that is what's motivated me to get that score and to improve my file with research the past year. So I definitely feel for you. If you don't get in... then you'll probably be in the same boat as I am. Just keep truckin. If by the grace of heaven and the soil of our blessed earth, UMass allows me to become a doctor, I will let you and everyone else on the eastern seaboard know.
Good Luck!
P.S. - For MCATs, I did almost every Kaplan question available and hiked in the white mountains in my free time (also full time job, but my production was reduced significantly).