Set of 3 books: Power Up Challenge 4th Grade, Kanji & Calculation Perfect Drill, and Summer Vacation Homework Helper ● Power Up Challenge 4th Grade April, May, June, July, August, September issues: Japanese & Math Challenge Course (Unused. Perfect for children who find the Standard Course insufficient) ● Kanji & Calculation Perfect Drill Kanji and calculation practice drill for Challenge 4th graders. Study for about 5 minutes each morning. This book has been used, with the first four lessons filled in and then erased with an eraser. See photos 6-9. ● Summer Vacation Homework Helper "Summer Vacation Homework Helper" for Challenge 4th graders. Useful for preparing for free research projects, book reports, and summer vacation homework. Mostly unused. Thank you for looking.