In a nutshell, you simply won't find it anywhere in public or private. If you are looking for 4-5 grades above age you need to basically do it on your own looking to your county for some things but taking on the bulk by yourself. My DS attends Stanford University's online high school via their EPGY (educational program for Gifted youth). You may want to look there. Hopkins CTY offers a lot of awesome options but Stanford is unique in that they offer an actual high school. My son manages most of the work by himself. I hired a tutor for higher order math and physics (sorry... I don't remember one whit of calculus). Look to CTY for additional things to keep him busy and engaged and their summer programs are very fun and give your kid a chance to interact with other kids of similar interest. My son has several friends from school that he hangs out with. He does attend 'normal' school part of the day with differentiation. Keeping him in school was his choice, he does online work at home. It works out well for us because it gives him a peer group, field trips, Phys Ed, school dances and all the other fun parts he would miss if he totally home schooled. That and I have a FT job

. I will tell you if you plan to meet with your school administration to secure a differentiated curriculum for your child come armed with test results and a plan because this is the DMV; every parent that meets with the principal is there because their "gifted" child is "bored" and needs a "challenge". Bring results they will understand. I brought Stanford Binet, OLSAT, SCAT and a plan. Oh, he does participate in 'normal' English class at school because he is far too busy to punctuate...