Nice work! How do you verify correctness of the generated exercises and explanations? To me this looks the biggest risk in becoming a user: what if my _teacher_ teaches me subtle nonsense that I cannot easily detect since I'm learning and unfamiliar with the material (even if it's only in the 1-2% of cases)? Human teachers make mistakes too, but an LLM cannot _understand_ that it made one...
So.. how do you solve for this issue of trust?