Yotsuya Otsuka Yosho Series 4th Grade Volume 1 and Problem Collection, Spring Seminar set. All with answer explanations. Purchased in 2022. Revised text. Both the text and exercise problem sets (excluding the Spring Seminar) for all four subjects consist of 20 sessions. There are no names written, but the Prefectural Master Volume 1 has traces of a name sticker being peeled off. The science and social studies texts have many pages with writing, as they have highlighted sections where the student wanted to memorize. The Kanji and Words, and the Prefectural Master Volume 1 were worked on as homework every time, so there is a lot of writing. Other than the above and the Spring Seminar text, I think there is relatively little writing. 【Math】 ・Textbook → 8 pages have been highlighted, and points have been written in. There are no pages with answers written in the problems. Math originally does not have answer sheets. ・Exercise Problem Set → Only 1 page has points written in red ballpoint pen, but there is no other writing. This also originally does not have answer sheets. 【Japanese】 ・Textbook → 4 pages have been highlighted, and 3 pages have answers written in. About 60% of the answer sheets remain. ・Exercise Problem Set → No writing. Answer sheets for sessions 2-14 were used. ・Kanji and Words → 3/4 is filled in, and answer sheets for sessions 2-14 were used. 【Science】 ・Textbook → 2/3 of the book has highlighting and points written in. There are 6 pages with answers written in the problems. About 30% of the answer sheets remain. ・Exercise Problem Set → There are 4 pages of answers written in the "Let's Summarize" section of sessions 1 and 2, but since there are identical ones on the remaining answer sheets, you should be able to use those without any problems. In addition, there are 2 places where the answers to the choices have been highlighted, and 2 places where the answers have been written in red ballpoint pen. 5 answer sheets remain. 【Social Studies】 ・Textbook → 40% of the book has been highlighted. There are no pages with answers written in the problems. Answer sheets for sessions 1-4, 6-9, and 20 remain. ・Exercise Problem Set → Answers are written in sessions 1, 4, and 6. Parts of the answer sheets for sessions 1 and 4 remain. ・Prefectural Master Volume 1 → Almost all answers are written in. Please also see the comment section.