There are 8 classes in total (8 letters of A, B, C, D, E, F, G and H are used instead of class names), and the competition adopts a single round robin mode. After drawing lots, Class A, Class B, Class C, Class D, Class E, Class F, Class G and Class H won 1, 2, 3, 4, 5, 6 and H respectively.
The first, second, third, fourth, fifth, sixth and seventh rounds.
A——H A——G A——F A——E A——D A——C A——B
B——G H——F G——E F——D E——C D——B C——H
C——F B——E H——D G
D——E C——D B——C H——B G——H F——G E——F