The ASVAB is no different than any other standardized test in that your approach to it can influence the score you receive. Before the test, study any review materials at your own pace. Keep a relaxed attitude about the test. Don't stay up the night before cramming; because the ASVAB has so many different parts, you need to be rested and ready to tackle every question. On the morning of the test, eat a filling breakfast and avoid caffeine and sugar. During the test, remain calm and focused. Don't watch the clock. Read each question carefully and choose the best answer. Work steadily and don't spend too much time on one question; if you find you don't know an answer and cannot eliminate any wrong answers, move on. If there's time at the end, you can return to the question.
Study in quiet places that are free of distractions. Military.com recommends making a study schedule so your studying is organized and proceeds naturally from the first day of studying to the day of the test. Make a list of your strengths and weaknesses regarding the ASVAB subject areas -- math, verbal skills, automotive, mechanical comprehension, electronics and general science -- and go from there. However, don't spend too much time on the last four sections -- they are considered "non-essential" to your score. Focus the bulk of your efforts on math and verbal skills, the "essential" sections that will have the greatest impact on your score.
Take an ASVAB practice test under normal circumstances to get used to the format of the test. Have someone time you -- the real test is timed, with nine to 36 minutes allotted for each section -- but avoid rushing. A practice test will also allow you to smooth over any rough spots in your test-taking skills or identify potential problem areas. If you freeze up on paragraph comprehension, for example, you'll know you need to study extra hard on that section. If you find you become nervous when you don't know an answer right away, you can practice staying calm and thinking through the question. Practice ASVAB tests are available online and in ASVAB practice books.