"乙種1・2・3・5・6類 Dangerous Materials Handler Examination 2023 Edition" Koron Publishing ※ No writing inside, but there are traces of use and erased pencil markings that are visible upon close inspection. Please refrain from purchasing if you are concerned about this. ※ As shown in photos 8 and 9, the binding of the book is slightly open in some places, and as shown in photos 10 and 11, the edge of the back cover is cut by about 4mm. ◎ By repeatedly solving these past questions and eliminating areas I didn't understand, I passed all of the 乙種 1, 2, 3, 5, and 6 categories in one go over a period of about two years. Please note that the packaging materials may be reused. ※ Please refrain from price negotiations. As this is a used item, thank you for your understanding.