Thank you very much for viewing. The following two books are being sold as a set: "Magic Tricks for Smoothly Solving Math Problems for Junior High School Entrance Exams - Calculation Problems" "Magic Tricks for Smoothly Solving Math Problems for Junior High School Entrance Exams - Word Problems" The covers show some signs of use, but the inside is clean with no writing. As these are used items, we would appreciate it if you could understand this before purchasing. Thank you.