Thank you for viewing. A set of 4 problem books with answers and explanations to support efficient learning. - Title: Super Efficient Problem Book: Social Studies - Title: Super Efficient Problem Book: Science - Title: Super Efficient Problem Book: English - Title: Super Efficient Problem Book: Mathematics - Features: Efficient learning possible in 3 steps - Format: With answers and explanations - Language: Japanese I have looked through them, and regarding the areas marked with a thick "✕", please be aware that there may be marks or remaining traces after erasing. The covers are in good condition. If you wish, I will take photos and send them to you. * Only the English answer key has been highlighted with a marker. However, it does not interfere with solving the problems. Retail Price: 6160 yen (Available for individual sale) Please feel free to ask any questions in the comments ^^ #Textbook