I did a year and a half ago before getting too busy with work. I found it to be a bit spartan, but still the most efficient tool for math study I've used. I wa

I did a year and a half ago before getting too busy with work. I found it to be a bit spartan, but still the most efficient tool for math study I've used. I was a math major long ago, so it was more a case of relearning than initial learning for me but the built-in SRS helped a lot and so did the granularity of the lessons. It's head and shoulders above Brilliant, IMO. If it didn't exist or I couldn't afford it, I'd probably go the OpenCourseWare approach. https://ocw.mit.edu/ https://ocw.mit.edu/