DS8 is on track to take AP Calc BC in 6th grade. We've been warned about some silly rules that he may not be able to graduate from high school because of this, but we're just not going to worry about it. We'll do what is pedagogically best (not too fast, not too slow, covering a wide range of topics, doing challenging problems). He'll take a bunch of college math courses before finishing high school. If a college would really reject such a student due to supposed lack of high school math credit, then they should not be taken seriously as an academic institution.