1, the key classes in Hua Yao pay attention to the teaching effect and the cultivation of students' academic literacy. The students in the class are generally of high quality and have a strong learning atmosphere, which stimulates and promotes learning progress. The large class size in Tianjin No.1 Middle School will lead to the dispersion of teachers' resources and the increase of teacher-student ratio, and teachers cannot give each student enough personalized attention and guidance.

2. Key classes in Hua Yao provide opportunities for students to participate in competitions and selection of various disciplines, including mathematics, physics, chemistry and biology. It provides a channel for students to show their abilities, win honors and further deepen their studies. Ordinary classes in Tianjin No.1 Middle School have relatively fixed subjects, covering major knowledge fields, and cannot provide opportunities for in-depth study in a specific field.