I'm selling these books because they've been sitting on my bookshelf unused. Would these be suitable for children who want to work through a lot of basic problems? I've listed them as "Acceptable" due to some scratches, folds, and names written on them, but there is no writing inside. Several books are titled "Shinshu Chapter," but the content consists of general problems. Photos 3 and 17: There is a faint stain on the back. Photos 6 and 12: I've covered the names with white masking tape. Photo 14: There is some advertising because it's a trial textbook from a company. Photo 19: The math book has a name written on it, and the spine is slightly torn. I will package them to be waterproof and protected from folding, and ship them via Nekopos for anonymous delivery.