Finish high school or get your GED to qualify for job placement in the military.
Review an ASVAB study guide online or check out ASVAB for Dummies or McGraw-Hill's ASVAB from your local library. Complete the exercises designed to improve test-taking abilities and comprehension of all nine ASVAB test subjects.
Take practice ASVAB tests. Online, look for sites with multiple tests, short and full-length versions, and community forums.
Compare your scores to military branch and career-specific requirements. Retake the online and written ASVAB practice tests and exercises until aptitude in your desired military career is achieved.
Contact a military recruiter to schedule an appointment to take the official ASVAB at a Military Entrance Processing Station (MEPS).