How many classes are there in Ningbo Xiao Chun Middle School?

20 13 I heard that it is arranged like this, for example, there are 480 students in 8 classes. Specific operation: Divide into four groups according to the lottery, each group 120 people. Each group is divided into fast classes according to the entrance scores of the top 60 students, and the last 60 students are slow classes, in which English is the characteristic. There are 60 people in the fast class, of which the top 30 have English classes and then enter the fast class, and the last 30 enter the slow class! There are two English teachers in a class who teach separately!