I believe the answers were written in a notebook, so there shouldn't be any writing in the materials themselves. However, I apologize in advance if I missed anything. Regarding "Kobun Jotatsu," I did write in some parts of the booklet, but I have erased everything with an eraser. The answer sheets have also been detached, but they are included. Please consider purchasing with the understanding that these are used items. No returns or refunds, please. I am also selling other reference books, so if you would like to purchase them as a set, please let me know in the comments section. #ReferenceBooks #UniversityEntranceExam