1, a more complete knowledge system: The knowledge system of five or three series books is relatively complete, covering a wide range of contents, and grasping the key points and difficulties of the exam more accurately. In contrast, Wan Wei's book has omissions or unclear explanations on some knowledge points.

2. The title quality is high: The title quality of the five or three books series is relatively high, and the title difficulty is moderate, which is suitable for most candidates, while the title of Wan Wei is too high or too low, which is not suitable for most candidates.