<p>I never understood the AB to BC thing. I’d never even heard of it before college confidential. At my school, strong math students go from pre-calc to BC, not-as-strong go to AB. In BC, we finished all of the material in early March and spent the rest of the time doing abstract series stuff. I can’t understand spreading out what we did in less than 3/4 of the year into two for somebody who is good at math. We all do fine on the AP too.</p>