While considered part of the non-commissioned officer corps by law, senior non-commissioned officers (SNCOs) referred to as chief petty officers in the Navy and Coast Guard, or staff non-commissioned officers in the Marine Corps, perform duties more focused on leadership rather than technical expertise. Promotion to the SNCO ranks, E-7 through E-9 (E-6 through E-9 in the Marine Corps) is highly competitive. Personnel totals at the pay grades of E-8 and E-9 are limited by federal law to 2.5 percent and 1 percent of a service's enlisted force, respectively. SNCOs act as leaders of small units and as staff. Some SNCOs manage programs at headquarters level and a select few wield responsibility at the highest levels of the military structure. Most unit commanders have a SNCO as an enlisted advisor. All SNCOs are expected to mentor junior commissioned officers as well as the enlisted in their duty sections. The typical enlistee can expect to attain SNCO rank after 10 to 16 years of service.
On the CAT-ASVAB, you answer one question at a time and can’t go back and change your answers once you’ve submitted them. If you answer a question correctly, you get a more difficult question, but if you are incorrect, you are given an easier question to answer. This is called “adaptive” testing. Once you finish a section you can go on to the next section at your own pace.
Educational Opportunities–More educational opportunities are available than ever before.  Alternatives to traditional education, such as online courses and weekend or evening programs, allow individuals to obtain higher education while working full-time.  New technology, such as live podcasts and streaming videos on demand, make it possible for people to learn at their own pace in their own place.  Education is a lifelong process.  Many people now choose to combine their education with work experience.  For instance, instead of attending a four-year college immediately after high school, some people get a two-year degree in a particular field and then enter the job force.  At some point, they may choose to complete a certificate program or a four-year degree to advance in their chosen field.  Other people choose to enter the Military to take advantage of the educational benefits and training that is provided.  There are a variety of occupations and career paths that you can pursue with different levels of education.  Do not rule out a given career field simply because you think that the educational requirements might be more than what you would like to pursue after high school.
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.