1, teaching methods are different. Xi An Fang's teaching methods in Class A are diversified, which makes students remember the knowledge in books more firmly, while the teaching methods in Class C are relatively single, which makes students remember the knowledge in books less firmly.

2. The learning atmosphere in the class is different. Xi An Fang has a strong learning atmosphere in Class A, which allows students to enter the learning state quickly, while the learning atmosphere in Class C is average, which prevents students from entering the learning state quickly.