But also, if you consider taking classes in test only form ok, why not simply drop out and take the GED?
My hometown had a program where you could get a district diploma with a GED and a few key credits (which you could take at community or state college easily enough if you preferred).
I enjoyed playing sports. I had really outstanding English, Civics, and History teachers. I had a lot of (not always positive, but useful still) social contact with my peers. High school is full of good things, just not all the time. Take the good, find a way around the bad. I don't think I'd be a better person today if I didn't experience high school.
It's easy to think that school is like a railroad, that the course is set and cannot be changed, but really it is just that there's only a few paved roads, and people will complain that they are stuck in traffic. If you have the inclination, you can go off-roading and have a blast. It just takes a little effort to get started.
I was lucky to have parental support, and top-class school administration, but working out this sort of arrangement seems less extreme and more practical than dropping out.