There are several HESI review books available on the market, but one of the most popular and highly recommended ones is "HESI Comprehensive Review for the NCLEX-RN Examination" by HESI. This book covers all the essential content areas that are tested on the HESI exam and provides practice questions and detailed explanations to help you prepare effectively. Other popular HESI review books include "HESI A2 Study Guide 2019 & 2020: HESI Admission Assessment Exam Review 2019-2020 4th Edition" and "HESI A2 Study Guide 2019 & 2020: HESI Admission Assessment Exam Review 2019-2020 4th Edition". It's important to choose a review book that aligns with your study needs and preferences.