Thank you for viewing. This is a thick problem collection with a lot of content. I checked the contents, and I don't think there are any markings. However, there might be some oversights, so I would appreciate it if those who understand that this is a used item would consider purchasing it. I believe it's a great deal compared to buying a regular problem collection. If the person using it is motivated f^_^; By the way, I was able to pass the entrance exam for my desired school, so it might be lucky! (^^)