If you think this is bad, wait until you start in the real world. Nursing profession can be brutal.
I do empathize with your nursing school experience. In nursing school, people are anxious and competitive, some do whatever it takes to get ahead. Some will try to cheat, some will just break down and lose it. Your biggest task is to maintain your intellectual focus and ignore the drama that pulls your focus away. Especially with so many women, it becomes so useless.
Find the strong students and figure out who you can trust. Find a tutor or a confidant. Chances are you'll find someone who you trust and chances are that will continue through nursing school :-)