I'm really waiting for somebody to figure out the correct interface for all this. For example, study mode will present you with a wall of text containing information, examples, and questions. There's no great way to associate your answers with specific questions. The chat interface just isn't good for this sort of interaction. ChatGPT really needs to build its own canvas/artifact interface wherein questions/responses…
* for each statement, give you the option to rate how well you understood it. Offer clarification on things you didn't understand
* present knowledge as a tree that you can expand to get deeper
* show interactive graphs (very useful for mathy things when can you easily adjust some of the parameters)
* add quizzes to check your understanding
... though I could well imagine this being out of scope for ChatGPT, and thus an opportunity for other apps / startups.