Self-study, the basic recommended teaching materials should be the complete solution or test sites, that is, the two books edited by Wang Houxiong are almost the same. Wang Houxiong's series of books are very popular, especially suitable for preview or basic self-study you need. Before my freshman year, I have been using teaching materials combined with the special topic of gantry mechanics (I) to fully interpret it. Now I am also studying 3- 1, because our teacher is better and speaks in depth, so I don't need to fully interpret it recently. The concept depends entirely on the understanding of lectures and Longmen electric topics, and will not be limited to basic concepts, and then it will be improved through Longmen electric topics (I). Physics has always been well studied. Longmen series is a little deeper than Wang Houxiong's book, but he will also make the concept clear. Although the Wang Houxiong series emphasizes concepts, it is also very in-depth, depending on how you choose. If you study well like this, there is still room for improvement. I recommend the new physics olympiad compiled by Fan Xiaohui.