All practice problems are written on the blackboard. I am also selling other Toshin texts, so I can offer a discount for combined purchases. Feel free to comment. Instant purchase is OK. Those aiming for Todai, Osaka University, Tohoku University, medical schools, Nagoya University, Kyushu University, Hokkaido University, etc., please consider. Sunghai, Kawaijuku, summer courses, winter courses.