This issue is the main reason why we homeschool. Our child would require radical grade skipping (depending on the subject, 5-8 grade levels). My just-turned-8yo would spend his days at the local high school; that is the best accommodation our school district could provide. Private schools would do even less, since they aren't bound to any of our state's GIEP laws. Facing those options, homeschooling is a no-brainer.