Reference books to learn 3 years of junior high school math and English in 15 minutes Learn Math for Life in 15 Minutes a Day: Junior High School 3 Years ◾️Supervised by: Toyofumi Konishi ◾️Published by: PHP Institute ◾️Price: 1300 yen (excluding tax) Learn English for Life in 15 Minutes a Day: Junior High School 3 Years ◾️Supervised by: Masakatsu Okane ◾️Published by: PHP Institute ◾️Price: 1300 yen (excluding tax) Used a little by a child, and stored. There are some yellowing and scratches. I don't think it will affect usage, but please refrain from purchasing if you are concerned. Please purchase if you understand that it is stored by an amateur.