The Professional Career Opportunities (PCO) Passbook® prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers that help candidates compete for traineeships or full-level, professional positions in various government agencies, including test subjects like: preparing written material; understanding and interpreting written and tabular material; verbal analysis; evaluating conclusions in light of known facts; understanding and interpreting statistical data into graphs, charts and tables; and other related areas.