I'm curious to learn more about your math use cases, as I haven't actually tried to use ChatGPT to learn pure math. What area and level have you been studying, and which model(s) have you tried to use to generate questions and solutions? Does it just give confidently incorrect solution-shaped gibberish?
I'm just doing grade 12 math, and I actually can't find what exactly didn't work for me. I use Gemini 2.5 Flash and I gave it my calculus assignment, and it seems to work well.