1. The green card of Peking University pays attention to the foundation, and the test questions are difficult. At the same time, it also attaches great importance to connecting with reality, and closely combines mathematical knowledge with real life, which fully embodies the interest of mathematics. It brought interest to students and laid a foundation.

2. First of all, the questions inside are real questions in the exam, which are very representative and the difficulty of the questions is moderate. Students with good grades or average grades will get a lot of progress from it, and their exams will also be greatly improved. Students facing the exam are very helpful. Therefore, everything has its own merits.