1, buy a thick problem set, prepare n notebooks, familiarize yourself with the concepts and theorems of the textbook, do examples and exercises of the textbook, and then do the problem set, do it every day, see the answers if you are wrong, and turn over the theorems or similar examples in the book.
2. Do test papers every day. If you are wrong, do it again on the wrong question. If you are right, look back at the paper made by 1 week.
3. Learn more biographies or introductions of some great mathematicians.