I agree with the replys to your post. Not knowing what subject, I can't give specific advice, but usually the first test is the most difficult because you are not sure of the test set- up, grading etc. One of the things I found for myself is that if I feel I have a good handle on information, I will move on to the things that may be more shaky and need special attention. Also, study in smaller intervals and get down what you are studying.
Don't give up. If you feel that you know the information but incorrectly listed it, talk to your professor. They may have pointers to help you. Maybe you have a slight learning disability, nothing to be ashamed about. Contact the testing center...there may be different ways for you to learn and retain what you are learning. If you made it into the nursing program, you have what it takes, and a minor slip is not a sign of failure.
Best of luck,
Kris:) :) :) :)