How hard would it be if i took all of the prerequisites for Pharmacy school and Medical school?

I want to be a doctor, more specifically a radiologist. I have an average of 3.7 in high school right now, i'm going into junior year next year. I also am interested in being a pharmacist. I'm worried that i wouldn't get into med school because it says somewhere that only 30% get in. So i was thinking that if i took all of the prerequisites for both then i wouldn't be screwed if i didn't get into medical school because i would be able to get into pharmacy school if things didn't work out. Would that be too hard to do all of the prerequisites? Also any good schools people could list would be helpful.