Just to note, in our district, I know kids that took only college math courses from 8th grade on, and there was no problem with HS graduation. They just needed to take three years of math while in HS - it was fine if those were graduate level math courses. I also have reservations about kids taking courses such as Algebra II, Geometry and Pre-Calc before age 11 - while they might get an A in those courses as an eight or nine year old, I also think that they would have a better, deeper understanding if they waited until age 11 or so. I truly think an 11 year old gets more out of rigorous proofs than an eight year old. Just my opinion, as I know others would disagree.
And there are potential issues with homeschooling in senior year, especially if the kid is involved in HS activities. In our state, the public schools must let homeschooled kids participate in ECs (sports teams, academic clubs, music programs). However, it is not this way everywhere.
