① Learning Poster Book → Only the Japanese map has traces of being stuck on the wall, but otherwise, it's like new. ③ Child Prodigy Picture Book → It has solid content for understanding the essence. ④ Problem book that thoroughly covers 6 years of elementary school math in one book → You can deepen your understanding by writing in it. #Takuya Kosugi #Takuya_Kosugi #Books #Nature/Mathematics #Compare and Understand #Hanamaru Learning Center #Junior High School Entrance Exam #Child Prodigy Picture Book #Elementary School Math in One Book #Learning Poster Book