If you can't come up with one, pick a situation in
which you did some really good academic work that you were really proud
of, or some other kind of genuine accomplishment. Not a fiction, mind
you—it's got to be from real life. Make it as detailed as possible.
Think about the sights, the sounds, the smells, even the tastes, that
you can associate with this experience of academic success.
Creative visualization
Creative visualization is a
great way to (almost) hypnotize yourself into bringing the job of test-taking
down to earth, and believing in your own abilities. Put yourself through
this exercise whenever the prospect of the exam starts to bum you out.
Keep making the vision of your succeeding during the exam more vivid each
time.