I did really bad on a lot of the prerequisites for USDO schools (like C-, C, C+, W), and I was wondering what I can do to them to improve it because the schools I looked at do not even take grades lower than C. I heard you can take upper level courses to replace them, is that true? Also, do USDO schools look at cGPA or just the prerequisites grades. Would they also look at if I took a full course load or not?