I bought this to get used to the test and to practice, but ended up using something else, so it's been stored at home, unused. Upon inspection, there are some stains as shown in the photos, but there are no stains on the answer sheets that the children will use, except for a small stain on the back of problem 5. The stains are on the question sheets that the parents will view. Since it often has similar content and question trends to elementary school entrance exams in the Kanto region, I think this is helpful material for families who are considering these two schools as their top choices, as well as for families who are considering it for practice! I will send everything together, including origami figures and story memory exercises!