Seconding the recommendation. I use ChatGPT recently to ask about various things. And although it (the unpaid GPT-3 version) makes many mistakes, it also often catches and explains my mistakes and misconceptions.

The fact that it makes mistakes is much less of a problem than it might seem, because when something feels fishy, I can ask extra questions. Unlike a human (or Bing chat) it won't get offended when I challenge its answers. "Previously you said X, now you are saying Y, how is that possible?"

I agree ChatGPT4 is helping me tremendously as a personal tutor, especially in a session that has been ongoing since the start of the semester last month. I've been using it to supplement my readings and assignments, asking for a better understanding of topics, and to explain things better than a section of text I may type into chat.

In my 50s, working full time, and having started my pursuit of a degree a little over a year ago by taking two classes per semester, ChatGPT is very helpful and worth $20/month.  Not only as a tutor but also some(thing)one to bounce thoughts off of.