Purchased and used to obtain qualifications in fiscal year 2023. I am selling it now that I no longer need it. There are some folded corners and wrinkles on the book, but there is no writing inside. Please understand that this is a used item before purchasing. "2018-2022 National Examination for Pollution Control Manager, Correct Answers and Hints, Water Quality, Types 1-4" Japan Environmental Management Association for Industry Price: ¥5,500