This is a junior high school science problem book for first-year students that develops skills through important problem exercises. - Title: High-Class Thorough Problem Collection: Junior High School 1st Grade Science - Format: Problem book - ISBN: 978-4-581-11027-8 - Features: Develops skills with a 3-stage structure - Content: Develops skills through important problem exercises - Explanation: Includes answers and explanations that clearly explain the thought process While there are no visible markings, please consider purchasing only if you can accept any oversight.