Waseda Academy Social Studies, 5th Grade Renforcement Problem Collection, Volume 1: 1 book, Answer Key: 1 book Total: 4 books. Names will be erased or cut out before shipping. Problem Collection: There are basic writings as it was submitted as homework. Answer Key: Basically no writings. Since it was used at the cram school, I will sell it to those who do not mind the details. For those who will finish in 2026.