Ventilation and Drainage Maintainer
National Learning Corporation has been a leading publisher of test-preparation Passbooks® for more than 50 years, with 6,000 titles available across 22 series. The Career Examination Series features thousands of titles designed to prepare test candidates for their upcoming civil-service job exam. Each book in the Career Series offers practice through multiple-choice questions and answers in relevant subject areas, as well as informative texts to aid in understanding the study material.