You can put your mind at ease by reasoning, arguments, facts, etc. Consequently, you should not tell yourself that
it is not too bad, when you are feeling very nervous, just to mention one example. Denial of facts, which cannot be
denied, makes you doubt about everything. All your preparation seems to be in vain.
But if you can admit that you are nervous, but that, on the other hand, you are well prepared, you can solve this problem. Face up to unpleasant facts, but be aware of reassuing facts (results of secondary education, previous tests, practice, prelims, etc.) at the same time.
Would you like to know more about