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. 
Arithmetic Reasoning tests the ability to solve basic arithmetic problems encountered in everyday life. One-step and multistep word problems require addition, subtraction, multiplication, division and choosing the correct order of operations when more than one step is necessary. The items include operations with whole numbers, operations with rational numbers, ratio and proportion, interest, percentage and measurement. Arithmetic Reasoning is one factor that helps characterize mathematics comprehension, and it also assesses logical thinking.
The Armed Services Vocational Aptitude Battery (ASVAB) is a comprehensive test that helps determine students’ eligibility and suitability for careers in the military. Students who score in the 31st percentile are eligible for a wide variety of careers (combined with standards such as physical condition and personal conduct). Students and schools are also encouraged to take advantage of a free career exploration program that links personal interests with demonstrated aptitudes from the 9 ASVAB subtests, half of which relate to vocational skills, in addition to math and verbal skills.
Auto and Shop Information tests aptitude for automotive maintenance and repair, and wood and metal shop practices. The test covers several areas commonly included in most high school auto and shop courses, such as automotive components, automotive systems, automotive tools, troubleshooting and repair, shop tools, building materials, and building and construction procedures.

My daughter bought this book to study for her ASVAB test. She took it the first time and did not get the score she needed. So she got this book to help her study and to raise her score. She took her test again and her score raised 14 points. I recommend this book to those that need help studying or need a higher score. The book has a lot of information about the test and has practice questions as well. Overall, the book is very useful for those who want to do well on the ASVAB.

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. 
Command over the U.S. Armed Forces is established in the Constitution. The sole power of command is vested in the President by Article II as Commander-in-Chief. The Constitution presumes the existence of "executive Departments" headed by "principal officers", whose appointment mechanism is provided for in the Appointments Clause. This allowance in the Constitution formed the basis for creation of the Department of Defense in 1947 by the National Security Act. The DoD is headed by the Secretary of Defense, who is a civilian and member of the Cabinet. The Defense Secretary is second in the U.S. Armed Forces chain of command, with the exception of the Coast Guard, which is under the Secretary of Homeland Security, and is just below the President and serves as the principal assistant to the President in all defense-related matters.[16] Together, the President and the Secretary of Defense comprise the National Command Authority, which by law is the ultimate lawful source of military orders.[17]
Anyone who is planning to enlist in the United States Armed Forces should be familiar with the military’s standards and screening processes. An important part of this screening process is the Armed Forces Qualification Test (AFQT), which is a subsection of the Armed Services Vocational Aptitude Battery (ASVAB). This standardized assessment measures a candidate’s skills in the areas of paragraph comprehension, word knowledge, arithmetic reasoning, and mathematics knowledge.

Trends in recruiting 1975–2001 showing total numbers of enlisted recruits in all branches of US armed forces in light blue and percentage of recruiting goals met in dark blue. Percentage of recruits with at least a high school diploma is shown in gold, percentage with an above average AFQT in orange, and the percentage called "high quality", with both a diploma and above-average AFQT score, is in purple.[1]

I purchased your AFQT Secrets file, and I just wanted to let you know that I got a 99% on my test. I just got my job of choice today of Military Intelligence Analyst, and I am now on the road to my future career in the CIA or NSA. I just want to thank you again, and hope you have continued success in your ventures. Sincerely, Paul L. U.S. Army (Intel Analyst
In Medieval Europe, tales of knighthood and chivalry, the officer class of the period captured the popular imagination. Writers and poets like Taliesin, Chrétien de Troyes and Thomas Malory wrote tales of derring-do, featuring Arthur, Guinevere, Lancelot and Galahad. Even in the 21st century, books and films about the Arthurian legend and the Holy Grail continue to appear.
Air Force recruits must score at least 36 points the 99-point ASVAB. The overall ASVAB score is known as the AFQT score, or Armed Forces Qualification Test score. Exceptions may be made, however, for a handful of high school graduates who can score as low as 31. The vast majority, some 70 percent, of those accepted for an Air Force enlistment achieve a score of 50 or above.

Figure out which areas to focus on based on your career goals. If you’re not interested in a job requiring a score on the Mechanical Comprehension subtest, you don’t need to worry about doing well on that subtest. If you don’t need to worry about mechanics, don’t bother preparing for that section. Spend the time on Word Knowledge or Arithmetic Reasoning.

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.

These supply points are also used to provide military engineering services, such as the recovery of defective and derelict vehicles and weapons, maintenance of weapons in the field, the repair and field modification of weapons and equipment; and in peacetime, the life-extension programmes undertaken to allow continued use of equipment. One of the most important role of logistics is the supply of munitions as a primary type of consumable, their storage, and disposal.
1001 ASVAB Practice Questions For Dummies takes you beyond the instruction and guidance offered in ASVAB For Dummies, giving you 1,001 opportunities to practice answering questions on key concepts for all nine ASVAB subtests. Plus, an online component provides you with a collection of additional problems presented in multiple-choice format to further help you test your skills as you go.

Test scores provide only one measure of your skills and abilities.  Test scores and grades, combined with information about your interests, values, skills, and achievements may help you select appropriate occupations for career exploration.  As you explore careers, you can compare your skills with the skill requirements of occupations in which you are interested.