I am a bit confused. Did your son only do one CTY camp and it was in debate? Is that your basis for saying the courses are not very challenging?

My son did a science course that we picked because it appeared to be less intense and had a field work element. However, friends took some of the more intense courses and found them challenging including fast-paced science (in place of taking the class at high school) and economics and philosophy. These courses were not easy and were in depth.

I would agree that for a 15yo, taking a class outside of her area of high knowledge and interest might provide a better learning environment.