I'm selling this textbook because I used it at cram school but no longer need it. It's a textbook for junior high school second-year math, for high school entrance exams, and includes answers and explanations. There are some pages with writing, but 90% of the book is clean with no writing. I erased my name from the place where it was written, but a slight mark remains. Please purchase only if you understand that this is a used item.