The overall grade is dependent on both your essays and MC, which are each weighted differently and are added together for a composite score which translates to the 1-5 scale. The cutoffs for the different scores also change slightly, as each exam is graded on a curve. I think you can find the expected/general ranges on AP Central.
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Actually 45% of BC test takers get a 5... not very hard, dunno what ur talking about
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The reason that % is so high is that a) the students who go that far in math tend to be much more self-selective than, say, the students who take APUSH (which is the most popular exam), and b) a very large number of those students have taken AP calc AB before, which is essentially what the BC exam is, but with a few additional topics.
It's like the AP Chinese score distribution: the % 5's is so high because of the type of student taking it and his/her past experience with the subject.