Man Kun's Principles of Economics belongs to primary macro and micro textbooks. This set of books is very thick for easy to understand. As a college student, especially a student of economic management, you can read the topics selectively. It is suggested to borrow it from the library and browse it once. The latest version is the seventh version in the picture, and the old version is acceptable. If you want to buy it, two volumes of macro and micro are enough, and you don't need to buy a workbook. After reading it, you can contact intermediate macro and micro textbooks. Fan Lian's Microeconomics: The View of Line Generation and Man Kun's Macroeconomics are recommended for reading. Combined with practice, a good knowledge system will be established for you.

I hope it helps you ~