Start by making sure you are prepared to write your exam. Study in advance so you are not crunching all your study time the night before. Give yourself time to absorb all of the materials.
Take in study materials one at a time. Study each part of the topic covered in segments and do not overwhelm yourself with information from different sections.
Wake up early the day of the exam. Eat a healthy breakfast and take some time to breathe deeply. The more calm you remain, the more you will stay organized and focused during your exam.
Go through each answer in the appropriate amount of time. Try to avoid feeling rushed by the clock. This rushed feeling will only make you get nervous and your answers will not come out the way you want them to.
Ask any questions about the test format if you are unsure about anything on the exam. The instructors won't be able to give you answers on the test, but they can tell you if you are unclear on the instructions.