Is this a postgraduate entrance examination or a college entrance examination? Postgraduate entrance examination mathematics takes the probability of high number linear algebra, not high school mathematics. You'd better not buy high school math textbooks, but buy advanced math books from Tongji. Quadratic equations are not needed. Mathematics is not like liberal arts. In fact, the ability to recite is of little use. If you don't understand, you can't do it with your heart. You buy a set of advanced mathematics, linear algebra and so on, chapter by chapter. After you finish learning, do the exercises in the back carefully, so that you can understand and do each problem correctly. You can practice more calendar year questions and simulation questions before the postgraduate entrance examination, and there will be no problem. In addition, undergraduate mathematics is not as strong as middle school mathematics. For example, advanced mathematics and line generation are exactly like two subjects. Now you can't meet the requirements of the postgraduate entrance examination, so don't waste your time.