✨Hazardous Materials Class 4 Exam Prep✨ I passed the exam on the first try after using this book. I've highlighted important parts, but there's nothing written on the questions themselves. Feel free to use it. Please understand that this doesn't guarantee a pass, and that this is a used item before purchasing. Supplementary Revised Edition textbook for Hazardous Materials Handler Exam. - Title: Class 4 Hazardous Materials Handler - Author: Takejiro Motoyama - Included: Memorization Notebook - Revised Edition: Supplementary Revised Edition - ISBN: 978-4-8107-1600-7 Thank you for looking.