Hi,

First check the syllabus of JEE Advanced. Check out the topics you know well and test yourself in them. The remaining ones you are wek in, pls start studying for them. When you complete one chapter, do the questions on them so you test yourself on whether you understood the chapter and you study was effective or not. As for books and topics, here is an article that will help you https://engineering.careers360.com/articles/jee-advanced-preparation-tips-physics-chemistry-and-mathematics All the best!