Yotsuya Otsuka's Most Difficult Problem Collection, Arithmetic, Grade 5, Complete Set (Volumes 1 and 2). Answers and explanations are included at the end of the books. There are no names written or any other markings. There were pencil markings on the diagrams of only 3 questions in Volume 1, but they have been erased (see photos 3 and 4). Since they have been used very little, I think they are in relatively good condition. I am not considering selling them separately. I would like to sell them to someone who will purchase the complete set. If you have any questions, please ask in the comments section. #JuniorHighSchoolEntranceExam #JuniorHighSchoolEntranceExam #YoshuSeries (Preparation Series) #WasedaAcademy #WasedaAcademy