The Armed Services Vocational Aptitude Battery is the most widely used multiple-aptitude test battery in the world. As an aptitude test, the ASVAB measures your strengths, weaknesses, and potential for future success. The ASVAB also provides you with career information for various civilian and military occupations and is an indicator for success in future endeavors whether you choose to go to college, vocational school, or a military career.
The ASVAB is a test that consists of eight individual tests, including general science, arithmetic reading, word knowledge, paragraph comprehension, mathematics knowledge, electronics information, auto and shop information and mechanical comprehension. The ASVAB test isn't just an evaluation for somebody interested in the military, but someone interested in learning more about their abilities and which occupations/careers they might consider in the future.
Take a practice exam
here.