Get plenty of rest tonight and eat a healthy breakfast. Also, drink enough
water so you are hydrated.
It is always a good idea to review the exam objectives before taking the
test, but it is never a good idea to cram at the last minute. In fact, several studies have shown that cramming before a test can actually have a negative effect on your score.
Read each question carefully and make sure you understand what is being asked. If you are unsure of a question, mark it for review so you can come back to it at the end.
Other than that, relax and do your best. Assuming you have been preparing, and you have taken some of the mock exams (which you can find on this site),
you should be fine. Good Luck!
“Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.” - Rich Cook