[tptacek]

Wholeheartedly recommend it, just remember we're not the core market for it (that's high school students, though the curricula goes all the way through the normal college math sequence).

Minutes later

In case I've spooked anyone, they have an adult course series (Foundations I, II, and III) that's accelerated by trimming out all the material their authors believe are important only for things like school placement exams; the modal adult Math Academy person is doing I, II, and III as a leadup to their Math for Machine Learning course, which is linear algebra and multivariable calc.

I think it's one of the three most mindblowing learning resources I've ever used. One of the other three: Lingua Latina Familia Romana. In both cases, I have the uncanny certainty that I am operating at the limit of my ability to acquire and retain new information, which is a fun place to be.