SDN Members don't see this ad. (About Ads) I'm between Chemistry and Biology for my major. I'm a transfer student with about two more years of lower division courses to go through. As far as lower division goes, the classes are nearly identical. Chemistry, however, requires a few more Calculus classes. Unfortunately, math is not my strong suit. When trying to get into DO schools, how much do they focus on what field your B.S. is in? Do they favor Chem majors over Bio? Would majoring in Chem better help me prepare for osteopathic school/MCAT?