Personally, I think the Introduction to Advanced Mathematics of China University of Science and Technology is better. There are many examples in this book, which are also representative. There are also supporting exercises after class to provide a foundation for consolidating knowledge points. In the process of learning, the first step is to recite the formula, which is the foundation relative to mathematics, but it needs to be understood with knowledge points, and rote memorization is generally only a short-term memory. The second step is to be able to understand the knowledge points of the examples and be familiar with the problem-solving ideas. The last step is to do more questions to strengthen. Mathematics is not better than liberal arts, and it may be improved to a certain extent in a short time. In addition, college mathematics is relatively coherent. For economics, calculus, economic mathematics and linear algebra pave the way for probability theory, and then statistics. . . Wait a minute. So come on! Kid! I hope these can help you.