The Custodial Laborer (USPS) 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 in the areas that will likely be covered on your upcoming exam, including but not limited to: following directions in performance of custodial duties; building maintenance and related trades; general and mental abilities; and more. | Custodial Laborer (USPS) (C-3316) by National Learning Corporation, Paperback | Indigo Chapters