I, like the OP, was also studying math from a textbook and using GPT4 to help clear things up. GPT4 caught an error in the textbook.
The LLM doesn’t have a theory of mind, it wont start over and try to explain a concept from a completely new angle, it mostly just repeats the same stuff over and over. Still, once I have figured something out, I can ask the LLM if my ideas are correct and it sometimes makes small corrections.
Overall, most of my learning came from the textbook, and talking with the LLM about the concepts I had learned helped cement them in my brain. I didn’t learn a whole lot from the LLM directly, but it was good enough to confirm what I learned from the textbook and sometimes correct mistakes.
Putting the 5 in PS5