Yotsuya Otsuka's Most Challenging Problem Collection, 5th Grade, 2 Volume Set (Upper and Lower) Most Challenging Problem Collection, Arithmetic, 5th Grade Waseda Academy Rinkai Seminar As shown in photo 3, there are about 5 check marks in the answers. This is a layman's inspection. The name was removed with nail polish remover, but it couldn't be completely erased, so it has been overwritten with a marker. Please use name stickers, etc. "Arithmetic's Most Challenging School Entrance Exam Problem Collection" Price: - #Book #Society/Education/Learning "Arithmetic's Most Challenging School Entrance Exam Problem Collection" Price: - #Book #Society/Education/Learning