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According to College Board, approximately 60% of the AP Calculus BC Exam is Calculus AB. This 60% is what is used to calculate your Calc AB sub-score.

Keeping that in mind, Calc AB is the basis for everything in Calc BC. The skills you learn in this class are preparing you for the more complex topics covered in Calc BC. The majority of what you learn you will continue to use and review throughout your Calculus BC class. However, remember to practice and review topics, such as optimization, that are not often used in the Calc BC class, but are often on the AP exam as prepare for the AP exam.