Book excerpt: The Postal Electronic/Maintenance/Mechanic Examination (955) 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: arithmetical reasoning; abstract reasoning; understanding and interpreting written material; tools both hand held and electrical; electronic equipment; safety; computer systems; ability to read and use technical drawings; mechanical comprehension; and other related areas.