<p>At my school, advanced (25%) people take Precalc their sophmore year, then Calc BC (2-period class) their junior year. Most people (50%) take Precalc junior year (50%) and then can go on to Adv. Functions, Discrete Math, or Calc BC, depending on how good they are. Regular people (25%) take Precalc senior year. There's also one person who took Precalc frosh year because he went to TIP for Algebra II.</p>
<p>Precalc, I've heard, is 1/2 review of algebra two and 1/2 limits. Calc BC is single-variable calculus (differentials, etc.)</p>