AP Calculus exams are one way to earn college credits. Another strategy is to skip over the AP Exams and have those students who finish AP Calculus BC (Calculus 2) jump into Multivariable Calculus (or higher) via online courses that are accredited. I personally don't like investing all of this pressure into a single exam - my kid just melts on that kind of pressure. So I had her jump forward past AP Calculus into the higher courses during her senior year. Our goal is not to get credit for Calculus AB and BC, just to have her skip Calculus altogether so she starts more advanced at university next year. Here are some that seem comparable: https://netmath.illinois.edu/college/math-241 https://www.distancecalculus.com/multivariable/ https://und.edu/academics/online/enroll-anytime/math265.html She is currently in Distance Calculus Multivariable Calculus now and doing great! These aren't free, but basically all the same price.