★ I would appreciate it if you read my profile. ★ No comment & immediate purchase is welcome. There are no markings in the problem sets. The practice mark sheets have some writing in problem set 2, but since they are not filled in, you can erase them with an eraser and use them. (See photos 3 and 4) The mark sheet for problem set 4 is untouched. CD included. The problem sets are slightly warped because they were leaning against something, but I don't think there's any particular problem. Please refrain from purchasing if you are overly concerned about condition.