Which AI model is good enough as an Undergraduate level Math/Physics TA?

Suppose I want to teach myself Undergraduate Math/Physics courses (e.g. Real Analysis), and from time to time I'd like to ask questions. Is there any AI nowadays that is good enough to answer the questions AS A TA? That is, not only can it give the correct answer, but it can also let me know why my answer is wrong, and hopefully can also explain some of the materials?