Elementary mathematics is very flexible in thinking, because just a few books, in order to reflect the so-called IQ, the topics are all around N bends, that is, N knowledge points are tested together, which is the so-called problem.

Higher mathematics pays more attention to attitude, because higher mathematics has very low requirements for elementary mathematics. A mathematical analysis in university covers almost the whole system from primary school to middle school. Many students in our university scored more than 140 in high school mathematics, and it was difficult to pass in the end. Some students from the west are average in mathematics, but they have always been among the best in universities. They depend on their attitude towards mathematics.

There are many college mathematics textbooks, such as mathematical analysis, analytic geometry, complex variable, real variable, topology, functional and so on. As long as you study hard, there is nothing you can't learn well.

Attitude is everything.