I'm restarting my own math education from the point of Calculus 1 so I can learn more about AI/ML, and want the college credits so that if I decide to do more graduate school, I will have solid prerequisites. I searched pretty exhaustively and settled on NetMath (https://netmath.illinois.edu/) which is a UIUC program. Most classes are self-paced and use Mathematica extensively, but you can go amazingly far in the program. I hope to get through their Calculus-based probability by about a year from now.