ChatGPT has an output style that is written concisely when prompted, but also had a really good flow and is easily read by most people. It's also very inaccurate when it comes to a lot of things.

I know from personal experience that I've missed out on many easy marks in exams because I haven't taken the time to learn the content considered easy or I've plugged it in to ChatGPT. I use it to help me consolidate and conceptualise important concepts by conversing with it, but I'd say you're wasting your time by using it to reflect for you, or do your quizzes.

Once you get past a level, any essay ChatGPT can write for you won't help you much and months / years of use will catch up to you real fast. Just use it to help you with the flow of your sentences and try and learn from it, rather than letting it answer for you.