I'm not sure about full year courses, I'm assuming that they would take the grade you received in December if it's on your transcript but I would double check on that one. I took reduced semesters a few times so I just counted backwards on my transcript and added it up to 20 half credits, which equaled my last 20 courses ending with the grades I got in December. For one semester only 3/5 classes counted, so no they will not choose the highest grade, they go off of the order listed. I hope this makes sense! Let me know if you need anymore clarification, this is my second time applying to Western so I'm familiar with the process!