Thank you for viewing. A set of 3 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 - Features: Efficient learning in 3 steps - Format: With answers and explanations - Language: Japanese I have looked through them, and regarding the areas with a thick "✕" mark, please be aware that there may be marks or remaining eraser residue. The covers are in good condition. If you wish, I will take detailed photos and send them to you. * Only the English answer key has highlighting. However, there is no problem in solving the problems. List Price: 4620 yen (available for individual sale) Please feel free to ask any questions in the comments ^^ #Textbook