To enlist in the Air Force, which is considered the most restrictive branch of the military when it comes to AFQT scores, you must have a minimum AFQT score of 36 if you have a high school school diploma. If you have a GED, you must score a minimum of 65. Less than1 percent of people who enlist in the Air Force each year have a GED instead of a high school diploma. In rare cases, the Air Force will accept a minimum score of 31, if an applicant has a special skill that the Air Force deems necessary, such as speaking a particular foreign language. Again, like in any branch of the military, your score not only determines your ability to enlist, it also determines your qualification of the various jobs within that branch.
The content of the test has been clearly laid out, but there is still a ton of information concerning the actual place where the test is administered and the time that is allocated for each section. The computerized test is administered in a “military entrance processing station” (MEP) or a satellite region that is identified as a “military entrance tests site” (MET). The difference in the two locations is that the METs are the places that are responsible for administering the written test, while MEPs are the places that administer the computerized tests.
Once you have learned about yourself, you are ready to begin exploring different career options.  Chances for a rewarding career are improved if you select a career field that matches your interests, values, skills, and abilities.  While learning about various careers, you should be constantly asking yourself, “How well does this career match my current interests, values, and abilities?” and “Will this career lead to a lifestyle I want?”
While you may want to get the ASVAB over with, it is important to give yourself enough time to prepare and practice for the ASVAB. Once you take the test you will have to wait 30 days before you are eligible to re-take the test if you got a non-passing score, or if you want a better grade. After you retake the test twice, you will need to wait for a 6 month time period before being able to take the test again. For this reason, it is important to pick an ASVAB test date that gives you plenty of time to practice and prepare for each section of the test.
In order to take the ASVAB at a MEPS for enlistment purposes, an individual will need to speak with a recruiter and schedule a time to take the test. ASVAB testing at a MEPS is self-paced and taken on a computer, and it may be retaken after a one-month waiting period.  Entitled the CAT-ASVAB, the test is adaptive – meaning it adapts to your ability level.
Whenever possible, military personnel (active duty, National Guard, and reserve) will arrange to take the in-service ASVAB from your service’s Test Control Officer at a military installation; however, on a case-by-case basis, Military Entrance Processing Station (MEPS) commanders may authorize administration of an ASVAB for in-service purposes at their MEPS. You must submit a memorandum from your unit commander requesting the MEPS to administer an ASVAB. The memorandum must include;

Understanding ASVAB scores is critical if you want to enlist in the U.S. Military and get the military career of your dreams. The ASVAB test is an aptitude test but is not a perfect measure of your knowledge, skills and abilities. Your scores do not guarantee whether you will be successful in a future occupation. Your ASVAB scores, however, need to be good enough to get you into the military branch of your choice.
To be admitted to the ASVAB testing room you will need to show a valid id. It is also important to be on time (or early!) since you will be turned away if you show up after the scheduled start time. The ASVAB can be given via computer or pencil and paper.  If you are testing at a MEPS site you will take it on a computer.  The pencil and paper version is given at most MET sites.  The computer version of the test is given as a "computer adaptive test" (CAT) which means that the test will adapt based on the level of the individual test taker (e.g., if you answer many questions correctly, you may be shown fewer questions).
After adding so much information to the aptitude test, there was a bit of difficulty interpreting the test results. In addition to that, a vast majority of test takers were deemed as being under qualified based on their test results. This is why the percentile change was made. It ensured that a 50% actually correlated with a person doing better than 50% of the test takers. Those revisions have worked hand-in-hand with the preparation of the armed forces.