This is the textbook used in the training course for Class 4 Hazardous Materials Handling Technicians, conducted by the National Hazardous Materials Safety Association for employees in the field. Although it's labeled as a textbook, it contains over 300 questions and three mock exams. During the lecture, it was said that you could pass the exam by repeating the questions in this book three times without using any other reference materials. I also took a correspondence course that cost about 20,000 yen, but after taking the lecture and following the advice to go through this red book three times, I was able to pass the exam successfully. The correspondence course was difficult, and while you could pass if you mastered it, it's challenging to achieve perfection. However, after repeating this red book three times, I was consistently able to score 80% or higher on the mock tests in this book and other published mock tests. This red book is sufficient for passing the exam. I highly recommend it. However, important parts highlighted during the lecture have been underlined in pencil, and circles have been drawn on incorrect answers in the question set, but the answers themselves have not been written in. Please understand this before purchasing. However, all writing is in pencil, and the answers to the questions have not been written in. Also, my name is written on the cover in ballpoint pen. This is the only part that cannot be erased. The highlighting in the textbook indicates the key points mentioned in the lecture, so for those who cannot attend the lecture, it might be helpful to see where the important points are. Before using this textbook, I recommend first getting a general idea by reading the "Manga Hazardous Materials Handling Technician" book that I have also listed. This is a lucky book that helped me pass the exam! The image shows the type of writing you can expect. Please assume that this kind of writing is present on each page. #HazardousMaterialsHandlingTechnician #Class4