Nowadays, no one is expected to remain perfectly calm during a polygraph test, even if the person in question is perfectly innocent and has nothing to hide. By allowing yourself to be nervous, you can provide the polygraph examiner with an accurate representation of your physiological statistics when you are being truthful and when you are lying.  The lines on the polygraph screen will never be flat and smooth, even if you are telling the truth. Oddly enough, only the person who is nervous about every answer will appear the most truthful on a polygraph test. If you have nothing to hide or be ashamed of, then tell the truth to each question you are asked. This includes control questions, for which many people are expected to lie. The more often you tell the truth, the more accurate the results will be. This is a good thing, as long as you are innocent.  While people often believe that there will be "trick" questions designed to trap them into a guilty answer, the current state of ethics surrounding the administration of polygraph exams demands that the questions remain straightforward. No surprise questions will be asked, either. Listen to the entire question thoroughly and answer it precisely. Do not listen to only half the question or answer the question according to what you think it asked rather than what it actually asked. You can ask the examiner to repeat a question two to six times, depending on who is examining you. Make sure that you find out how often you can ask for a question to be repeated before the test begins. Do not rush through the questions, since this sense of haste can skew the results against you. Questioning usually takes five to ten minutes, but it may take longer depending on how often you ask to have the questions repeated, how long you take to answer the questions, and the nature or reasoning behind the test.
اسمح لنفسك بالقلق. تحل بالصدق. خُذ وقتك.