Used for home study. Price is for 3 books. I am selling the ones I didn't use. I am not selling any books with even one page written in, so the series is not complete. Please understand that these have been stored at home before purchasing. 【Various Drills】 The "Tensai Nou Drill" series offers a variety of problems to train number sense and language expression. There are levels from intermediate to advanced, allowing learners to choose according to their abilities. 【Target Age】 This series is mainly aimed at elementary school students and is characterized by its enjoyable content. It includes many problems to enhance thinking skills. 【Publisher's Reliability】 Published by Juken Kenkyusha, a highly reliable publisher specializing in education. It has a proven track record as a study guide. - Title: Tensai Nou Drill Number Sense Intermediate - Title: Tensai Nou Drill Number Sense Advanced - Title: Tensai Nou Drill Language Expression Advanced - Publisher: Juken Kenkyusha - Target Age: Elementary School Students - Difficulty: Intermediate - Difficulty: Advanced - Difficulty: Advanced Thank you for viewing.