Is there a lottery method for badminton? There are about twelve classes, all with about 100 students.

It should be based on the class, divided into four groups of ABCD, each group has three classes. After playing a round robin like A vs B and C vs D, the worst class in each group was eliminated, leaving two classes in each group, resulting in the quarter-finals. Then, the first place in Group A will beat the second place in other groups, and the second place in Group A will beat the first place in other groups. . . . . . Another round of semi-finals, according to this record, can produce the champion and runner-up.