What is the difference between Single variable calculus and AP calculus?

The AP Calculus AB course and the normal Calculus 1, 2, and Differential and Integral Calculus courses on Khan Academy cover essentially the same topics of single variable calculus. You can start with either, but I would recommend the Calculus 1 course here: https://www.khanacademy.org/math/calculus-1 if you're not sure which one you want to begin with. 

Hope that helps! Please let me know if there is anything else I can help you with. 

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