There is supposed to be some sort of oversight by the state, and parents are supposed to show that their kids hit certain benchmarks at certain ages (though she isn't sure how the reporting/testing is done), but says that in practice there is literally no oversight.

She's just told me about her experiences having previously home-schooled children join her class and her friends/coworkers classes. She says that she has never (in two years of teaching) seen a home-schooled student who was functioning at grade level on all subjects. Some horror stories include families with several children (at varying ages) all being taught the same material together, despite the fact that one child was in 5th grade and the youngest in 1st grade. The 5th grade sibling was relearning the 1st grade material for the third time (another sibling in between), and was on a 2nd grade level. Another story about a mother who was upset that her 2nd grade child was being "pushed too hard" when given remedial 1st grade material. The mother didn't realize that her child was at a kindergarten level.

I don't really care if parents want to homeschool (I think sometimes where there are behavioral issues, it can be for the best), but absent experience or exceptional abilities, I think most parents are setting their kids up for educational and social failure.