^^?!??!! @pastelblue
Calc BC includes all the topics in Calc AB so technically you don’t have to do anything. My kid didn’t do anything in between these two classes. You can use Khanacademy.com to review precalc topics, or you can preview Calc topics.
From the College Board:
What is the difference between AP Calculus AB and AP Calculus BC?
The difference between AP Calculus AB and BC is one of scope, not level of difficulty. AP Calculus AB includes techniques and applications of the derivative, the definite integral, and the Fundamental Theorem of Calculus. It is equivalent to at least a semester of calculus at most colleges and universities.
AP Calculus BC includes all topics in AP Calculus AB, as well as additional topics, such as differential and integral calculus (including parametric, polar, and vector functions) and series. It is equivalent to at least one year of calculus at most colleges and universities. AP Calculus BC is an extension of AP Calculus AB, and each course is challenging and demanding and requires a similar depth of understanding of topics.
http://apcentral.collegeboard.com/apc/public/courses/220396.html