Problem book for developing logical thinking skills for junior high school entrance exams. - Title: The Strongest Science - Edition: Revised 4th Edition - Target Audience: Junior High School Entrance Exams - Contents: Problem book for developing logical thinking skills - Author: Seizan Hasegawa Thank you for viewing. I purchased this but it is unused, so it is in beautiful condition. There are no writings or folds. Please consider that this is a used item.