The Certified Nurse Examination Series prepares individuals for licensing and certification conducted by the American Nurses Credentialing Center (ANCC), the National Certification Corporation (NCC), the National League for Nursing (NLN), and other organizations. The Occupational Health Nursing Passbook prepares you for your test by allowing you to take practice exams in the subjects you need to study, including occupational nursing; preventive medicine; public health; hygiene; toxicology; and more.