Hello all! I've been on and off this forum for a little bit now. Background: Graduated from top 50 (US News, as if that means anything) school with a degree in applied chemistry with a 3.2 gpa. I had two papers published in organic chemistry, one poster in analytical and did research abroad in inorganic as well. However, because I wasn't in chemistry originally, I took short calculus and didn't spend a lot of time studying my math and thus got mostly Cs and a B. Not to mention that math has always been a bit of a weak point for me (I'm working on it!). I took general physics, which was more theoretical and less math based (dubious at best, right?) and I aced those classes. Also, I did mostly well in engineering physical chemistry (esp. group theory and QM). It was mostly because of these courses that I began to understand a lot of the math I had completely brushed off earlier, and at that time, I was already a third year and thus it was somewhat unreasonable for me to go back and retake math (Plus, my school generally didn't allow unless you got a C- or below). I've since become interested in astrochemistry, but with so few schools offering graduate degrees in that, I'm not sure how to go about this--should I try to get a physics masters before an astrophysics PhD? Should I retake engineering/sciences calculus at a community college to "prove" myself? And if so, what grades should I really be looking for--I.e., if I don't get an A in calculus, I ought to switch my career path. What I'm looking for: What sorts of grades did you get before getting into a graduate program? How can I prove to myself and schools that I'm able to hold stand up to the rigors of a physics degree? Or should I really pursue something else?