I took plant biology many years ago during my freshman year and got a "D". Is the course added to my science GPA if it is given by the plant biology department and not biology dept.? I am considering retaking the course but I have already completed my BS degree so the new grade would go into my post-bacc GPA. Would this still help me or would I be waisting my time? I have heard that DO schools replace new grades with old grades but would this be so in my case since it is post-bacc? My undergrad GPA was a crappy 2.8 which is why I am starting post-bacc courses. If I dont include the "D" my undergrad science GPA is a 3.2. I had a very bad year early on in my college career so it dragged my GPA way down.