You can read junior high school textbooks from grade one. Mathematics in junior high school is often very simple. It won't take long for junior high school students to learn math by themselves from grade one to grade three. Junior high school mathematics is mainly to improve students' interest in mathematics, focusing on the cultivation of computing ability, so there is almost no difficulty.
The most classic is, of course, advanced mathematics in Tongji. Most of the versions used in other schools are written with reference to this book and are personalized. Not much recommendation, because the most popular books on the market are basically good.
At present, most textbooks in this digital age have QR codes, so you can scan the codes and watch the teaching videos of relevant chapters (generally, it takes only ten minutes to explain the definition, and most of them are scripted).
The first step is to read the textbook and the definition. Advanced mathematics has built a new world. You should read the rules before entering this world. Definition is not necessarily the most important, but it is always important.
Next, I want to read high school math books. High school mathematics is the overall planning of primary school mathematics, which can be said to be a basis for learning mathematics. When studying senior high school mathematics, we should do more senior high school exercises to lay a good foundation for this primary high school mathematics stage.
The formula is the main one. It's best to deduce the formula yourself, so as to draw inferences. Then use the formula to practice the basic questions first, and then test and conquer the medium questions after the trapezoidal surface. Finally, do difficult questions. Don't do problems blindly, it's inefficient. Combine with the formula.
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High school mathematics is generally divided into algebra and geometry, and is divided into sequence, probability, analytic geometry, plane geometry, solid geometry and so on. It is enough to supplement the exercises according to the order in which senior high school students learn knowledge.
Then we enter the study of advanced mathematics, which can also be called the study of calculus, which is the content of college mathematics. There will be some difficulties in learning advanced mathematics. Some abstract understanding and complicated formulas are a great difficulty, but don't worry, it is not difficult to overcome them slowly through practice.
After learning these, you can also teach yourself probability statistics, linear algebra, numerical calculation, operational research and other courses. If you can solve the exercises in these courses by yourself, your math ability will be very good. Of course, it may be much worse for mathematics majors, but it is quite equal for undergraduates and graduate students.