There are nine sections on the exam: General Science, Arithmetic Reasoning, Word Knowledge, Paragraph Comprehension, Mathematics Knowledge, Electronics Information, Automotive and Shop Information, Mechanical Comprehension, Assembling Objects, and Verbal Expression. The time limits for each section range from 10 – 36 minutes; the entire exam takes three hours.
The Armed Forces Qualification Test (AFQT) is used by all of the Services to determine if an applicant is eligible for the military. Four of the ASVAB subtests are combined to form the AFQT. It measures general cognitive ability and is composed of verbal and mathematics subtests. AFQT scores are grouped into categories for reporting purposes. The table below shows the AFQT categories and the percentile score ranges corresponding to the categories. Applicants that score in AFQT category IIIA or higher may qualify for enlistment incentives.
There are nine different test areas as part of the ASVAB: general science, arithmetic reasoning, word knowledge, paragraph comprehension, mathematics knowledge, electronics information, auto and shop information, assembling objects, and mechanical comprehension. The paragraph comprehension test area contains the fewest questions with 15. The word knowledge test area contains the most questions with 35. All other sections contain 20, 25, or 30 questions. Taking numerious ASVAB practice tests is recommended for test day success.

The vast majority of people who take the CAT-ASVAB test finish it as the time constraints are not very aggressive. However, if a respondent isn’t able to finish in time, the remaining unanswered questions are scored as if the respondent had answered them randomly. This is obviously not an ideal way to finish up the test and most often results in even poorer scores.

AFQT scores are the primary measure of recruit potential. Figure 2.7 indicates the percentage of NPS recruits who scored at or above the 50th percentile (Categories I–IIIA) since FY 1973. Numerical data are in Appendix D, Table D-12. The drop in Category I–IIIA recruits after FY 1976 was due primarily to the miscalibration of the ASVAB. [1] In FY 1976, when new versions of the ASVAB were introduced, an error in calibrating the score scales made the new versions "easier" than the old versions (i.e., applicants received test scores higher than their actual ability). In FY 1980, an independent study of the calibration was made and the test was correctly calibrated. Then, Congress added legal provisions stipulating that no more than 20 percent of accessions could be in Category IV and that such accessions had to be high school diploma graduates. [2] However, as previously stated, Defense Planning Guidance decreases this limit even further, allowing no more than 4 percent of recruits to come from Category IV.

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?”
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.
As an adjective, military originally referred only to soldiers and soldiering, but it soon broadened to apply to land forces in general, and anything to do with their profession.[2] The names of both the Royal Military Academy (1741) and United States Military Academy (1802) reflect this. However, at about the time of the Napoleonic Wars, 'military' began to be used in reference to armed forces as a whole,[2] and in the 21st century expressions like 'military service', 'military intelligence', and 'military history' encompass naval and air force aspects. As such, it now connotes any activity performed by armed force personnel.
The Kaplan guide has everything I needed to prepare myself for the exam. The book was a great help for refreshing my memory in math and English for the test. Timing yourself on the practice tests is also a great way to make sure you are ahead of the game and never worry about time in the actual test. This is one of the best study guides I have ever seen or used but be prepared to spend time doing the work. As I said it will take hours to go through the material and learn what you need. I believed this book had a direct result in scoring an AFQT of 99. Excellent Book!
GED holders who earn 15 college credits 100 level or greater are considered equivalent with those holding high school diplomas, so that they need only the Tier I score to enlist. Eligibility is not determined by score alone. Certain recruiting goal practices may require an applicant to achieve a higher score than the required minimum AFQT score in order to be considered for enlistment. Rules and regulations are subject to change; applicants should call their local recruiting center for up to date qualification information.[4][5]
After a candidate has completed the ASVAB they must wait one calendar month before retaking the exam. An additional calendar month must pass before retesting a second time. Six calendar months must pass before retaking the test a third time. The scores received from the ASVAB may be used for enlistment for up to two years from the initial test date. 
The Student ASVAB is the most flexible of the exams. It is typically provided to high school students to help them assess their skills, job prospects, potential military positions, or college majors. The ASVAB for students is essentially the same as the MET ASVAB exam, only students are not necessarily testing for positions within the military. The students’ school counselors examine their scores and help them decide on what to do after graduating from high school. This test is still an important component of a student’s education because it can help them identify their strengths and weaknesses and help set them on the right track for their future career goals.