This is a set of four books for the Class 1 Sanitation Manager exam for the 2024 academic year. The two books, "Sanitation Manager (Volume 1)" and "2024 Sanitation Manager Exam Question Collection," have some writing in them as shown in the photos, but the other two books are in almost pristine condition with little to no writing. I passed the Class 1 Sanitation Manager exam on my first try using this four-book set, so I highly recommend it. It's a great deal, as the retail price is equivalent to 9,000 yen. Thank you.