I'm selling these items because I've been too busy to study and haven't been able to find time for the exams, so I've decided to postpone them. Both items were purchased in near-new condition, and while I haven't used them at all, the back cover of the textbook has been folded due to careless storage. It's difficult to see in the photos, but there's a noticeable crease on the left corner, so I'm selling it to someone who doesn't mind. Due to the thickness and inability to stack them, they will be shipped via Yu-Packet Post.