All the practice problems are written on the blackboard. There are writings throughout the book in pencil and colored pens. I am also selling other Toshin textbooks, so I can offer a discount if you purchase multiple items. Feel free to comment. Instant purchase is OK. For those aiming for Todai (University of Tokyo), Osaka University, Tohoku University, medical schools, Nagoya University, Kyushu University, Hokkaido University, etc. Also for those using Sun-Dai, Kawaijuku, summer courses, and winter courses.