I have exams coming up, and after learning the new tools I need to succeed after my accident, I am very confident! Sure I'm a little nervous, but I think that's normal.
My first nursing exam.... god! it was terrible! I totally bombed that exam, and like you, I studied so hard and dedicated every minute to Fundamentals. If you fail, don't worry! That too is normal! I'm not saying don't study, or put time into your studying, I'm saying that if you don't get a good grade on your first nursing exam, don't beat yourself up.
Nursing exams are tricky, and a completely different learning style. Unlike your basic science classes, you cannot memorize the material. You have to apply what you know to the exam question. You will learn how to do this, it just takes time. If you don't do as well as you hoped, sit down with the instructor and find out what it is you can do to prepare for the next exam.
Remember, nursing school
is a learning process. You aren't expected to get good grades on every single exam. Good luck!