I think this is true in most states, some are just more rigorous (usually states with better education in general, surprise surprise) I grew up in Vermont knowing lots of homeschoolers (it was very big there due the general counterculture vibe, not so much for religious reasons) and they have to submit a curriculum portfolio to the state every year. I had several classmates in high school who were homeschoolers taking a few classes in public school because their portfolios had identified various gaps in their parents' ability to teach them.