My son attended NHSGA last summer via virtual. They ask for high school transcript (and test scores if available). You also need one letter of recommendation and an essay. I thought they mentioned a previous year had 50% acceptance rate–200 applied, 100 accepted, but I could be wrong as those stats are from 2018?
Most of my son’s teammates were all very bright kids with either lots of art or programming experience. Those who didn’t were good project managers. There were a few that were not as strong, but I assume their grades may have gotten them in.
I think it was a selective program since it’s the only 6 week game academy around. My son has good stats and a teacher recommendation. It was like applying to college. I would still recommend having your child try applying, it’s an expensive program so you will have that to your advantage. Good luck!