<p>My BC class was primarily juniors (I went to one of those schools…) while I took it as a senior (and still found it really hard).</p>
<p>Most of the kids who took Calc BC as sophomores or juniors at my school are taking Calc 3 right now. </p>
<p>PreCalc would be the prerequisite. My school was set up so that you took either AB or BC. Different schools do things differently.</p>