Purchased as a textbook for a commercial high school. The textbook on the right does not have answers. There are writings on 52 pages out of 143 pages. The information processing certification mock exam question collection on the left has writings on 23 pages out of 176 pages. This also includes the answer key. There are no writings on the part for the two certification exams. The writings are in pencil, so they can be erased. Please understand that these are used items before purchasing.