So I suggest you do something simple first. Then, in a similar, slightly more difficult way, when you encounter something you can't do, don't lose heart and just stick to it.
I believe others have told you the above methods, so let me talk about my own methods. You can read more examples in the book, don't just read them, copy them according to the examples, and be careful when copying them, so as to understand why each step above is and what formulas and theorems are used.
I will remember more times, so that when I do my own problems, I can get a comprehensive understanding. If you are sure you have no time, you can do less, because math homework is enough. I suggest you copy more examples, be sure to understand each process, and apply the skills of examples when doing your homework. This is a process. Stick to it and it will be much easier to learn in the future.
The examples in the book are very classic, don't just read them. If you only look at them, you will feel that you know everything, and you must start writing math. Also, you'd better prepare an error book and collect the mistakes you usually make. Whether it is unintentional or unintentional, or what you think is classic, write it down. If you have time to look at it, you will gain a lot.
If you still have a heart, write down your own experience for each question and make a key point in one or two sentences. When I was at school, I collected a few wrong books, which was very rewarding. Students around you sometimes want to borrow it, because your previous mistakes are your weaknesses, so you should study it again and again. Mathematics is a subject that needs many people to do it.