[TalonDJ]

Few parents can teach math, languages, grammar, history, science or any other subject which has any substance to it.

Statistics show otherwise. I have seen studies that show even mothers without a highschool diploma can homeschool kids to a level that scores much higher than average on standardized tests. And, no, I am not going to bother to look them up for you.

[justshutupandtakeit]

Those studies, like most others, rarely stand up to expert statistical analysis. And would suffer from the problem of comparing disparate populations in any case.

Just standardizing scores of students from two parent families
in the public schools and comparing them to HS students would eliminate most or all the differential. Comparing them to the top public schools would likely not be favorable to HSers.