If you learned something, it is not a complete failure. What can you do different this time that might help you succeed?

Back in the day, I failed taking blood pressures. I am almost done with my master's degree, so don't let the bump in the road slow you down. You are doing the best thing by moving forward and going to class. The best thing is to meet with the instructor to show you are vested in improving - ask for suggestions on how to proceed, tutors, study help, etc.
Nursing is a great profession with so many ways to practice, that the sky is the limit. Always challenging, but the rewards are amazing!