① Title: Advanced Problem Solving in Mathematics I + A + II + B Pages 10-56: Pencil markings and such have been erased as much as possible with an eraser. There may be some that were missed. The cover has scratches and stains. Please check the photos. ② Comprehensive Study: How to Write Descriptive Answers in Mathematics I + A + II + B Pages 24-61: There are 9 pages with orange marker highlighting. There is some marker writing and slight scratches on the cover, but the condition is good, I think. Please check the photos. Please refrain from purchasing if you are concerned, as this item has been stored at home. If you have any questions, please comment.