Don’t be fooled by the appearance of the low numbers, the algorithm that computes the AFQT is very sophisticated. Just because your ASVAB score is 40 doesn’t mean that you only got 40% of the questions correct, it could simply mean that you lack strength in one area, but succeed with high praise in another. Your ASVAB score is only a means by which you are categorized for available positions; it is by no means a measure of intelligence.
The four most important sections of the test—Word Knowledge, Paragraph Comprehension, Arithmetic Reasoning, and Mathematics Knowledge-make up your Armed Forces Qualifications Test (AFQT) score. Your AFQT score ranges from 0 to 100 and determines if you are able to enlist in the military and which jobs and programs you may qualify for when you are in.
This study guide offers in-depth preparation for all areas of the Armed Services Vocational Aptitude Battery (ASVAB). Each lesson comes with a fun, informative video to help you get up to speed on the same subjects the ASVAB will test you on. As you review each lesson, try the accompanying self-assessment quizzes to reinforce your understanding of the material. You can also access the course at any time using your computer or mobile device.
The ASVAB is a series of tests developed by the Department of Defense and is used by the U.S. Army to determine whether you have the mental aptitude to enlist. The ASVAB also helps determine which Military Occupational Specialties (MOS) you qualify for. The ASVAB is required to enlist in the U.S. Army and is valid for two years. The ASVAB may be given in a computerized version at a Military Entrance Processing Station (MEPS) or in a paper version at various Military Entrance Test (MET) sites around the country or at high schools and colleges. 
To coordinate military strategy with political affairs, the President has a National Security Council headed by the National Security Advisor. The collective body has only advisory power to the President, but several of the members who statutorily comprise the council (the Secretary of State, the Secretary of Energy and the Secretary of Defense) possess executive authority over their own departments.[18]
Tests are administered at participating schools. Neither schools nor students incur any costs for taking the ASVAB or using the Career Exploration Program. A test administrator is provided for every testing session and that person has no additional recruitment responsibilities. Various accommodations are available for the ASVAB, such as having questions read aloud, providing extra time, and other accommodations. School staff members are responsible, however, for tests that are administered with accommodations because test administrators are only able to administer the ASVAB by following the standardized procedure. If the test is being used for enlisting, only scores obtained during standardized test sessions (with no accommodations) can be used.
High school and postsecondary students can also take the ASVAB test as part of the Department of Defense’s Career Exploration Program. This paper-and-pencil version of the test is the same as the paper-and-pencil enlistment version but excludes the Assembling Objects section. It is intended to help those students considering a career in the military to discover their strengths in both military and civilian jobs. If the student scores high enough in the AFQT section of the test, he may use the score to enlist within the two-year expiration window.

The ASVAB also known as the Armed Services Vocational Aptitude Battery is a test that measures your aptitude which is how well you do something.  A common mistake by most people is thinking that it is a measure of you IQ. Many people either forget this or don’t know this and they get worked up about the exam.  Saying that, it is also important to take a ASVAB sample test to insure you know what type of questions will be asked.    Another thing to keep in mind is every person in the armed forces has to take the exam and you are not being called out to take it. 
Jump up ^ Iversen, Amy C.; Fear, Nicola T.; Simonoff, Emily; Hull, Lisa; Horn, Oded; Greenberg, Neil; Hotopf, Matthew; Rona, Roberto; Wessely, Simon (2007-12-01). "Influence of childhood adversity on health among male UK military personnel". The British Journal of Psychiatry. 191 (6): 506–511. doi:10.1192/bjp.bp.107.039818. ISSN 0007-1250. PMID 18055954.
Mathematics Knowledge tests the ability to solve problems by applying knowledge of mathematical concepts and applications. The problems focus on concepts and algorithms, and involve number theory, numeration, algebraic operations and equations, geometry, measurement and probability. Mathematics Knowledge is one factor that characterizes mathematics comprehension; it also assesses logical thinking.
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