A book is good. Many knowledge points in a graffiti book are very detailed, and the divided areas are easy to understand. Reviewing is a good choice. In particular, there are some topics that will appear repeatedly in the test paper, while Xueba's notes are too concise, the knowledge points are not detailed and the content is difficult to read, so chemistry is a good book. Advantages of scribbled books: the notes are flexible, and it is convenient to circle a word and directly interpret it. It can better locate the text content and avoid note fights. Disadvantages of a graffiti book: the text is too dense and it is difficult to locate the content.