In CA, homeschoolers can file a Private School Affidavit and then do whatever they like, including unschooling. The middle school years tend to be kind of a holding pattern anyway, repeating a lot of info from earlier years while waiting for pubescent brains to mature. Even if the OP plans to put the student back in school for 9th grade, letting him spend a year pursuing his own academic interests before he gets stuck in the HS rat race of APs and PSAT/SAT/ACT prep and testing, could be a gift, not something that ruins his life and will leave him friendless and academically behind. If heās gifted in math, he can take online classes from AOPS (Art of Problem Solving), which offers really challenging math courses for the type of kids who do math competitions. He can study subjects that interest him that arenāt offered in schools, and do an intensive study of a foreign language. Homeschooling is really not that hard, especially if youāre not trying to replicate PS at home.
I also disagree with the idea that a smart kid who excels at a sport should just focus on academics, not the sport. Athletic success isnāt just about scholarships, it can be a huge boost in admission chances at elite schools. And thereās no reason a really bright motivated student canāt offer both academic and athletic excellence ā a 35 ACT, 4.0 GPA, and a top ranking in a sport will get you more admissions and scholarship offers than a 35 ACT, 4.0 GPA, and no sport. I speak from experience as the parent of a top academic kid who was also tops in his sport and whose college options ranged from full rides and near-full-rides at Power 5 schools to offers of admission at elite Ivy and Ivy-level privates.