Online course resources are useless and too slow. I suggest you buy a book such as a green card, which contains a summary of the knowledge points in each chapter and examples. When learning each chapter, online Baidu searches the courseware of this chapter, and there are many PPT formats in Baidu library. You can buy a Baidu library account that can change your mobile phone and password. Your wealth is about 3,000 yuan, which is 10 yuan. You can download many PPT courseware and teaching plans. Finally, it will be much easier to read encyclopedias, courseware and textbooks.
The basic knowledge has been learned, and the rest is learned by doing problems. At this time, you have to buy books from the question bank such as May 3rd, all kinds of expansion, changes and derivative questions, and learn more thinking methods and problem-solving ideas, so that your grades will not be bad.