The solution key and the test / quiz key have little to no writing in them. They are very slightly bent and scuffed. The textbook has check marks next to many of the exercise numbers, as though they had been assigned. The video student practice exercise book has writing on about every 3rd or 4th page. Some of it is pencil, and some is red ink. The textbook has stains on the text block and the cover, and it is scuffed and has some bent pages. See photos for detail