I am a Canadian student and took 1 full year biology course with lab in first year but I got less than a B-. However, I took a third year animal behaviour course (a biology course) that was a year long with lab and I got an A. I also took two other biology courses in first and second year where I did poorly but I aced the rest of my bio courses afterwards. So, how do medical schools determine which course to use towards their prerequisite requirement?