The Admission Test Series prepares students for entrance examinations into college, graduate and professional school as well as candidates for professional certification and licensure. The Dental Hygiene Aptitude Test (DHAT) Passbook® prepares you by sharpening the skills and abilities necessary to succeed on your upcoming entrance exam. It provides a series of informational texts as well as hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: numerical ability; biology, chemistry and physics; verbal ability; and more.