The winning rate is as follows:

1. Zhongshan No. 1 Middle School: 6,078 people participated in the lottery, with 415 degrees and a winning rate of 6.82%.

2. Zhongshan Overseas Chinese Middle School: 5,182 people participated in the lottery, with 527 degrees and a winning rate of 10.2%.

3. Zhongshan Experimental Middle School: 3,936 people participated in the lottery, with 113 degrees and a winning rate of 2.87%.