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<p>I really do not understand why schools would require a student two grade levels ahead in math to take calculus over two years (one year for AB followed by a year for the rest of the BC stuff).</p>
<p>When I was in high school there was only one calculus class – BC. Most of the students were one year ahead of the normal math sequence, while a rare student every few years was two years ahead (and was generally assumed to be easily able to handle the BC course as a junior in high school). Later, when calculus demand increased to two classes’ worth of students, they made one class BC and one class AB – a student chose either one for the year after precalculus (though they presumably encouraged the better students to choose BC).</p>