Purchased in the first semester of 2024. There is a slight fold in the answer key, but there is no writing inside. My child used it, so please forgive any minor imperfections. This is a textbook training for the revised edition. "Shogaku Kyokasho Pittari Training Rika 3-nen Tokyo Shoseki-ban (Completely compatible with the textbook, all-color, easy-to-mark answers, 7 special Pittatore extras! / Free 3-minute summary video / Science Startup Drill / Summer, Winter, Spring, and Year-End Tests / Research Support Poster / Effort Chart / Excellent Mark Stickers / Observation and Experiment Cards)"