"Revised Edition: The World's Easiest to Understand Kyoto University Science Math Passing Course" Tetsu Ikeya Price: ¥2300 #TetsuIkeya #Tetsu_Ikeya #Book #Nature/Mathematics I think it's in good condition. Almost no signs of use, no writing. The best book for developing your skills in the second stage. It's not worth doing unless you consistently have a math deviation score of 65 or higher on the Sundai National Mock Exam. If you can solve it on your own, read the explanations, and understand them, you'll be able to further improve your skills."