The Environmental Control Technician Passbook(R) 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 in the areas that will likely be covered on your upcoming exam, including but not limited to; Arithmetic computations; Reading comprehension; Preparation of reports; Interpretation of schematics for parts and equipment; Preparation of reports; Safe and proper working practices; and more.