I got a B- on my first draft, then got a C on the final draft because I hadn't done as much rewriting as my classmates. The fact is that not everyone can get bumped up and others get bumped down. I just didn't put in work, but you did and clearly missed some things that you needed to do that at least some of your classmates with a lower grade on the first draft discovered. Try to meet with your prof and get some insight into the process. Good luck.
During the semester, I read the cases and took illegible notes in the margins, putting in 2-3 hours a night max. During finals week, I decided to get serious I studied 4-5 hours reviewing my highlighted text, notes and student bar outlines the day before each exam, then got drunk because all of my tests were in the afternoon. I have most definitely put in less work than anyone else in my gunner section. You're not a slacker, I am.
Every single time I got called on in class, I got PWNED because I wasn't paying any attention. Several times I bet I got called on because it was clear that I was the only kid playing online poker, slouched in the back row. Plus I don't brief.