Set up the following four groups according to the results of the contestants:

1, primary school middle grade group: 20 16 students who are not higher than the fourth grade of primary school before September;

2. Senior grade group of primary school: students who are not higher than the sixth grade before September 2065438+2006;

3. Junior high school grade one group: students who are not higher than junior high school grade one before September 2006+2065438;

4. Junior high school grade two group: students who are not higher than junior high school grade two before September 20 16.