Yotsuya Otsuka Yosyu Series 4th Grade Volume 1 and Problem Collection, Spring Seminar Set. All with answer explanations. Both the textbooks and exercise workbooks (excluding the Spring Seminar) for all four subjects are structured with 20 lessons each. There are no names written, but the Prefectural Master Volume 1 has traces of a name sticker being removed. The science and social studies textbooks have highlighted sections where the student wanted to remember, so there are many pages with writing. The Kanji and Words, and the Prefectural Master Volume 1 were used as homework every time, so there is a lot of writing. Other than the above, I think there is relatively little writing. 【Math】 ・Textbook → 8 pages have been highlighted, and points have been written. There are no pages with answers written in the problems. Math does not originally have answer sheets. ・Exercise Workbook → Only one page has points written in red ballpoint pen, but there is no other writing. This also does not originally have answer sheets. 【Japanese】 ・Textbook → 4 pages have been highlighted, and answers are written on 3 pages. About 60% of the answer sheets remain. ・Exercise Workbook → No writing. Answer sheets were used for lessons 2-14. ・Kanji and Words → Written in for three-quarters of the book, and answer sheets were used for lessons 2-14. 【Science】 ・Textbook → Two-thirds of the book has highlighting and point writing. There are 6 pages with answers written in the problems. About 30% of the answer sheets remain. ・Exercise Workbook → There is writing of answers on 4 pages of "Let's Summarize" in lessons 1 and 2, but since there are exactly the same ones on the remaining answer sheets, you should be able to use them without any problems. Other than that, there are 2 places where the answers to the choices are highlighted, and 2 places where the answers are written in red ballpoint pen. Only 5 answer sheets remain. 【Social Studies】 ・Textbook → 40% of the book has highlighting. There are no pages with answers written in the problems. Answer sheets for lessons 1-4, 6-9, and 20 remain. ・Exercise Workbook → Answers are written in lessons 1, 4, and 6. Only a part of the answer sheets for lessons 1 and 4 remain. ・Prefectural Master Volume 1 → Almost all answers are written. Please also see the comment section.