This is a set of Keirinkan's "Advance Alpha Mathematics I+A" and its "Answer Key." It's a reference book and answer collection useful for studying high school mathematics. [Brand] Keirinkan [Category] Study Reference Book [Condition] Slightly scratched and stained There are some scratches and stains on the cover and corners, but the inside is in relatively clean condition. There were pencil markings in the problem book, but they have been erased. There were no markings in the answer key. Please consider this item understanding that it is a used product. Thank you.