I will be selling some of my personal textbooks due to a job change (August 18th). I purchased this on Mercari. It's a two-volume set. I think it's probably new. I bought it thinking I would use it, but I got a new job before I could, so it's in pristine condition. If you're buying Gekokujo Arithmetic, you probably won't need this. This is recommended for those who find Gekokujo Arithmetic to be too much. I will also be selling other textbooks for junior high school entrance exams.