I am a math major. First of all, advanced mathematics also has basic disciplines, mathematical analysis, advanced algebra and spatial analytic geometry. As for your question, you can't understand these three courses without high school knowledge. At this time, you must go to see elementary mathematics. Because you have no foundation and need to consult a lot of things, reading will be inconsistent, which is not conducive to the cultivation of thinking. Moreover, there are some things in advanced mathematics that elementary mathematics can't explain. You can't understand these simple jumps without foundation, so laying a solid foundation is the key, otherwise you will find it difficult to read, let alone exercise your thinking.