This is the Doraemon's Fun Strategy Series. There are 5 types: Figures, Word Problems, Force/Electricity, Biology, and Astronomy. There are a total of 5 books: 2 for arithmetic and 3 for science. ● Understand Biology (Plants, Insects, Animals) ● Understand Astronomy ● Understand Force and Electricity, Sound, and Light ● Understand Word Problems ● Understand Figures Each book shows signs of use, but I think they can still be used. There is some yellowing and wear, but there are no writings or tears. Please refrain from purchasing if you are sensitive to these issues. It seems that it is difficult to understand the concepts using reference books, but it seems that these books were enjoyable to read. They were placed next to the reception desk of a junior high school entrance exam cram school, and the teachers also recommended them. Please consider them if you are interested. Junior High School Entrance Exam Fun Strategy Science Arithmetic