- American Contractors Exam Services
 - Offers contractor's licensing exam preparation as well as an online bookstore. - CDL Test Answers
- Commercial drivers license (CDL) test preparation and study guide designed to help truck drivers pass their written examinations.
- Command Productions
- FCC license home study materials. Audio cassette crash course for general radiotelephone operator license exam.
- LearnATest.com
- Academic and vocational test preparation materials and guidance for civil service, emergency medical services, firefighter, law enforcement, and other careers.
- Veterinary Correspondence Revision Course
- Offers review materials for veterinary exams.
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