Veterinary Technicians are professionally certified by the Veterinary Technicians National Exam (VTNE)
American Associaton of Veterinary State Boards -- http://www.aavsb.org
American Association of Veterinary State Boards (AAVSB) is the single entity that reports national licensing examination scores to the jurisdiction(s) where a veterinarian or veterinary technician desires to be licensed. This site has links to test sites, state boards and approved continuing education information.
Martindale's The Virtual Veterinary Center -- http://www.martindalecenter.com/Vet.html
This personal website has a comprehensive collection of links to websites and course and textbook content.
VetTechPrep -- http://www.vettechprep.com/
A commercial online, interactive study resource for the VTNE licensing exams available only by individual subscription; a database of more than 2000 questions formulated to highlight primary areas of interest in veterinary medicine. They offer a practice and a test mode.
VetMedTeam Online Review Course -- http://www.vetmedteam.com/home.aspx
VIN (Veterinary Information Network) -- http://www.vin.com
Offers resources to prepare for the VTNE