Due to the long hours of studying for entrance exams, even though the university entrance exams are over, I felt anxious that I had to study something, so I ended up buying books for a certification exam. The green one is the textbook. The pink one is the workbook. In the end, I only read them on the day I bought them. There are no markings inside. I stored them with covers, so the outsides are clean. The textbook is divided into sections, and I separated them for portability. (See photo 5. You can see the separation when looking at the top cross-section) The workbook is also divided into sections, but it's still new as I never opened it. I would like to sell them to someone who can use them effectively.