Some notes and marks. The HESI A2 Secrets Study Guide is a trade paperback textbook written by the Mometrix Nursing School Admissions Test Team and published by Mometrix Media LLC in 2015. It is designed to help nursing students prepare for the Health Education Systems, Inc. Admission Assessment Exam. With 179 pages of content, this study guide focuses on providing comprehensive review and guidance for nursing students seeking to pass the HESI A2 test. The book is written in English and covers a variety of subjects related to nursing test preparation and review.