Head Custodian - Paperbackby Passbooks (Compiled by) The Head Custodian 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: principles and practices of building maintenance; building cleaning; understanding and interpreting written material; supervision; and other related areas.