Firstly, good luck on your exams! I have one left until I'm finally free.
I couldn't agree more with you that I'm feeling burned out - I'm always a pretty stressed out person but I've definitely crossed way over the line into distressed this exam season and it's only making me do worse.
In terms of grades, my current average is about 70 but I'm way past worrying about keeping it there this semester - I just want to pass. I can relate about the field being competitive as everyone around me (except me) seems to want to go into medicine or a similar field and obviously it sets the bar very high. I know I failed my first exam (and therefore failed the unit), and it's pretty hard to walk back into another exam the next day after such a confidence hit.
It's good that you have an idea of where you want to go though! I worry every day about the fact that I don't know what to do when I finish, and it only makes it harder to stay motivated to do well. It also makes the thought of failing even more scary, because I don't know where I might decide to go and how some bad grades might affect my opportunities.
I'm trying to maintain a pretty good sleep schedule, it's just been pretty hard when it takes me hours to get to sleep and therefore leaves me really tired the next morning and throws everything out of sync.