You mean summer school? What did he have to take that other kids did not have to?
Adding a small amount of home schooling could help in advancing your kid to a higher track. How does he do in the state-wide standardized tests (are there any)?
She didn't have to go to summer school, but she did have to complete a packet of about 250 worksheets per subject, do several crafts projects (of the kind we all hate

), complete about a dozen labs for science, do a research project for math, etc.
in three weeks after the end of school. They did not give her a textbook, nor would they give us the name of a textbook for any subject. Then she had to go in and take a four hour long test per subject and get a 90% on it in order to qualify.
We had discussed getting her moved up to the honors class for the following year (8th grade) with the guidance dept and principal early in the school year. At no time did they ever tell us about the worksheet packets and testing until the final week of school. They didn't give her the packets until the last day of class. Because we had no idea she would need to complete a mountain of work in three weeks, we had already signed her up for a two week music camp for the first two weeks after school. That was prepaid and non-refundable, so we were out $650.
This is a kid who was in the top 90% of the state assessments in all subjects, had a straight A report card in 7th grade, and received the school award for academic achievement in 7th grade.
The principal said straight out that they do everything they can to keep kids stuck in whatever track they get stuck in and try very hard not to let them test out or otherwise move around. So, they put them through academic hazing. He was really PO'd that she completed the requirements and passed the tests.
Dh is a 9th grade teacher (in a different district where there is no question she'd be an honors student), and he knew she was totally capable of doing honors work.
The reason she wasn't in the honors classes earlier is because she didn't do particularly well for about six months in fourth grade when I had been diagnosed with breast cancer and was going through chemo. The kid had, understandably, a hard time with it. But they tracked her and wanted her stuck there forever.