@annewhitney, my D. took algebra II and geometry at the same time this year, precisely for the reason of getting AP calc in. She is the only one in our whole county who finishes algebra II as a freshman, together with geometry. She later found out from her CTY friends "if I hadn't done that, I'd be like a year behind compared to CTY people." She doubled math this year. There was a lot of homework, but not hard. She may not be really a science kid. But she is a strong academic kid.
Yeah I know things must be so different now compared to when we were in high school - I did not grow up in this country. but from the way my husband talks, (he did grow up here) it's almost like a cultural gap between now and 30 - 40 years ago.