I purchased this book, but only used it a little because I joined a cram school. (Chapter 1: Positive and Negative Numbers, Addition and Subtraction, Multiplication and Division I only did the first 6 pages.) Answers are included. There is no particular damage to the parts that haven't been used, and I think it can still be used, but please refrain from purchasing if you are looking for a perfect item. A study guide to strengthen junior high school first-year mathematics with a 3-Step format. - Title: High Class Test Mathematics for Junior High School 1st Year - Language: Japanese - Format: Study Guide - Features: Develops top-level academic ability with a 3-Step format - Publisher: Juken Kenkyusha - Target Grade: Junior High School 1st Year - Contents: Problem set for regular test preparation and academic improvement Thank you for looking.