This is a textbook for cram school. It's for public integrated junior and senior high schools. I don't think there are any answers written in it. There might be some writing that doesn't affect the content. Please forgive any oversights, as it was used by a child. The parts where the name was written have been cut out, but it doesn't affect the content. The answer key is also included. How about it for studying, review, or entrance exams? Only the math check tests, 1-14, have been used and removed.