Armed Services Vocational Aptitude Battery (ASVAB):
Military.com - http://www.military.com/ASVAB - This free resource is provided by Monster Worldwide, a company focused on helping people research and improve their careers. There are three short ASVAB practice tests and three full-length tests available. Additionally, users may find information on what the ASVAB is, what scores are desirable by various military branches, and in depth information on all military branches. There is a link for students to contact recruiters too.
ASVAB Test Resources