This is a set of 25 Saipa Kokugo (Japanese language) problem books. Only 3 of the 25 books have writing in them. The writing is on 1-2 pages, and the number of pages with writing (1 or 2) is indicated in red ink on the cover of each problem book, along with a photo. There are numbers written in black marker on the bottom right corner of the covers. These indicate the recommended grade level for the problem book. On the covers of 3 books, the number "②" is written in red marker. I've forgotten what math subject it was for. I think it was probably a mark to indicate that I was going to do 2 pages each. On the cover of one of those 3 books, "2 pages" is written. Most of the 25 books haven't even been opened. Regular price: 500 yen per book + consumption tax #M.access #エムアクセス #Cognitive Engineering Co., Ltd. #Junior High School Entrance Exams #Problem Books #Saipa Thinking Skills Arithmetic Practice Book Series