Actually, Jack, home school parents often co-ordinate withprivate and charter schools that offer individual classes in math and science.--they also co-ordinate with other home school families to provide activities like sports, chorus, band/orchestra. There are a lot of resources available.

Also, even though it is is true that many home school families have what some may consider fundamentalist religious beliefs, often they pull their kids out of the public schools to protect them from teasing, bullying, and other sorts of intolerance, as expressed by Lizzie, above.

As BillD points out, it isn't something that most parents can manage to provide. Our school systems, and our ideas about public education, need to be seriously reconsidered, but I'm not holding my breath.