Thanks to you, we've sold over 500 copies! We apologize if we sell out due to popular demand; we will relist once we print more. Licensed Hazardous Materials Handler, Class 4 Class 4 National Qualification This is a "Tora no Maki" (secret scroll/guide) summary note for passing the exam. We've compiled what we believe are important points onto 5 double-sided A4 sheets. Instead of thick reference books, let's memorize these 5 concise sheets for now. I'm a humanities major and self-taught seller (housewife), but I passed the exam after about a month of studying from zero knowledge. (Correct answer rate: Laws 100%, Physics and Chemistry 90%, Properties and Fire Extinguishing Methods 100%) Recommended study methods: ① Memorize the contents of this note as much as possible. ② Use a free Class 4 app (in your spare time). ③ Search for past exam questions online and solve them. ↑ Repeat these steps. Let's pass the exam without spending too much money! I created this with the hope that many people will pass.