It should be a paradigm shift that students should not panic before examinations.
So that they can be calm and more efficient in studying.
We may exactly know how to control it but such direction is where we ought to reach.
It is wise to be calm and steady no matter how is the preparation, given the action performed is necessary, ie. spending time to revise, before exams.
Anxiety and worrisome are good for nothing except giving a life of hell.