<p>Students can take AB then BC or just BC depending on how tough the rest of their course load is and what they feel they can handle. I took the AB class but got a 5 on the BC test in the same year and now I’m taking the BC class because the school doesn’t take the time and effort to recognize the connection between the AP tests and their courses, or the different courses with each other. People can take Physics C while in precalc or take AP Chem with just Algebra I (though nobody does the latter). There have been a few isolated cases where people have done things like skip pre-calc entirely, though this is because teacher recommendations can override board policy for student placement in courses, though the calculus teacher has never let anyone take BC calculus without AB Calculus or Pre-calc.</p>