Making mistakes is a part of life, and learning to accept them as such will reduce your stress levels significantly. Trying again will probably render some positive results. The stress signals that were discussed above will give you the indication that you need to slow down and take some time to relax. You cannot begin to cope unless you are able to recognize the times when you are being strained. Having a regular exercise routine, getting sufficient sleep, and eating properly play a large part in coping with life's twists and turns.
Exercise is a great outlet for frustration and anxiety.
Eating properly and getting enough rest also help you to stay in top physical and mental health. If you need help dealing with stress, see the Health Service or the Counselling Service on your campus. Both are experienced in helping students reduce and cope with the stresses and responsibilities of university life.