National L Corporation

With 6,000 titles accessible over 22 series, National Learning Corporation has been a leading publisher of test-preparation Passbooks(R) for more than 50 years. Thousands of volumes in the Career Examination Series are meant to help test candidates prepare for upcoming civil-service employment exams. Each book in the Career Series includes practice problems and answers in relevant subject areas, as well as useful texts to help students grasp the topic.