All practice problems are written on the board. There are writings throughout the text. I am also selling other Toshin textbooks, so I can offer a discount for combined purchases. 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 suitable for those using Sun-Dai, Kawaijuku, summer courses, and winter courses.