Mathematics II only tests advanced numbers and line generations, many of which do not need to be tested, and line-surface integral and triple integral infinite series do not need to be tested. It is suggested to buy a book by idiot Li Yongle and review it according to the book review. Some will review, some will not use, and there is no pressure at all. If you are not at ease, you can refer to last year's math syllabus. Come on!