Just remember, that exams are there to verify how much you have learned and not to see how much you didn't. Don't get stressed. Just take a deep breath, relax, and read the questions thoroughly. Look to see what is exactly asked and not what you "think" is being asked. Alot of students tend to answer beside the question. If you don't know an answer, skip the question, go to the next. At the end, use the remaining time to go back to those questions. But most importantly, don't get stressed. Nervousness is known to cause memory blanks.
Do you best. Gambate, random