1. There are many examination subjects: The entrance examination for Chengdu No.7 Middle School requires not only high marks in Chinese, mathematics and English, but also physics, chemistry, biology, politics, history and geography.

2. Difficult knowledge points: Knowledge points not only require candidates to master basic concepts and principles, but also require profound understanding and flexible application ability.

3. fierce competition: tens of thousands of students take exams every year, and only a few people can get in.