This is a math problem book for first-year junior high school students, with a wealth of problems and detailed explanations. * Geography problem book for first-year junior high school students * Used as a textbook in advanced schools and cram schools * No writing inside * Includes answers and explanations Used for only one month. The answers and explanations are slightly wavy, but it's not noticeable. Please refrain from purchasing if you are overly concerned about this. No claims or returns accepted.