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<p>Basically, a one year AB course can be thought of as a slower paced calculus course than a one year BC course or one year college / university course, since AB tends to give at most the first semester of calculus credit, while a sufficient score on BC can give up to the first two semesters of calculus credit at many colleges and universities.</p>
<p>I do not know what A, B, and C are supposed to mean by themselves in the context of AP Calculus AB versus BC. You may have to ask the College Board.</p>
<p>The colleges and universities probably know that there are many high schools like yours that decelerate calculus by requiring students to take a one year AB course and then a one year BC course. Though you may want to ask the colleges and universities if you are concerned about it. Nevertheless, if you are two or more grades ahead in math, that should still look plenty good at most colleges and universities.</p>