Waseda Academy 6th Grade Rensei Problem Collection: Social Studies (Volume 1) - 1 book, Answer Key - 1 book Science (Volume 1) - 1 book, Answer Key - 1 book Total: 4 books. The books have been marked with the owner's name, which will be erased or cut out before shipping. There are writings and red pen markings as the books were submitted for homework. These books were used at a cram school, so they are being offered to those who don't mind minor imperfections. These books are for students who will finish in 2026.