Just a thought, "getting ahead" can be for that child's own enjoyment. The concept of getting the required tasks complete in an efficient manner so that you can focus on the tasks most interesting to you is a skill I think everyone can benefit from. Certainly it helps to learn this sooner in life than later.
I took summer school to get classes like Health, Drivers Ed, and so forth out of the way to make room in my schedule for classes I wanted to take but wouldn't have been able to otherwise: Woodworking, Introduction to Networking (ICDN1), and Computer Repair (A+ Cert).
Also, summer school was a neat experience. It was ran much more like a long lecture in college than your standard high school class and introduced me to people that became friends I wouldn't have otherwise met.