This is the Obunsha Kiso Mondai Seikou Chemistry Basics and Chemistry textbook. I changed my study plan soon after buying it, so it has been stored at home without being used. There is no writing inside, and it is in a clean condition. *This product is the fourth edition of the old curriculum. Please be sure to confirm this. Thank you for your understanding. It contains a total of 111 problems, and is a collection of good problems with careful explanations and commentary, so you can efficiently learn the basics of high school chemistry while grasping the key points. The level is for the Center Exam, Common Test, famous private universities, and the basic level of MARCH and mid-ranking national universities. If you want to study chemistry, why not consider purchasing it?