This is a home-stored item. This is a set of Yosyu Series and Exercise Problem Books. Math 4th Grade, Volume 1 Exercise Problem Book Math 4th Grade, Volume 1 Japanese Language 4th Grade, Volume 1 Exercise Problem Book Japanese Language 4th Grade, Volume 1 Kanji and Words 4th Grade, Volume 1 Science 4th Grade, Volume 1 Exercise Problem Book Science 4th Grade, Volume 1 Social Studies 4th Grade, Volume 1 Exercise Problem Book Social Studies 4th Grade, Volume 1 All have answer keys. Regarding writing: Math: Many problem numbers have writing. Japanese Language: Much writing in pencil. Kanji and Words also have writing on some pages. Science: Much writing with highlighters, etc. Social Studies: Similar to Science. If needed, I can include a notebook for reviewing Math weekly tests. Please refer to the photos. Please see photos 6 and 7. Names have been erased with a black pen. Due to the large number of items, I have not confirmed if all answer sheets, etc., are present. Overall, I believe they are still usable, but please consider purchasing with the understanding that they were used by a child and have overall signs of use. Please understand that these are home-stored items, check the photos carefully, and then make your purchase. Thank you for looking.