Compared with light series, light series is better. Yi series textbooks have added the real questions of previous exams. The knowledge points are comprehensive and thoroughly explained, including the important test sites of the note series. It is helpful for candidates to sum up their memories and easily grasp the important and difficult points of the note series with the help of map situations. The teaching materials of bt education are gradual, the knowledge points are not as much as those of Yi series, and the important test sites are not as clear as Yi series, so the teaching materials of Note series are good.