Exam days are stressful, especially for kids like the ones I have.
I always try to lighten the mood and relax them when I hand out a test. I call my tests "love" and tell them when I hand them out to pass the "love " to their classmates. Some get the "love" handed to them personally. I tell them that I love to see how well they learned the topics we studied.
Of course, many of them have learned nothing but on test days they all come in asking for the "love" and hopefully approach the exam without the usual trepidation.