One highly recommended review book for APUSH (AP U.S. History) is "AP U.S. History Prep Plus 2020 & 2021" by Kaplan Test Prep. This book provides comprehensive coverage of key historical events, themes, and concepts tested on the AP U.S. History exam. It also includes practice questions, full-length practice tests, and detailed explanations to help students prepare effectively for the exam. Many students have found this book to be a valuable resource in preparing for the APUSH exam.