What are signs that you should quit your job?

I feel so stuck, I just came back to my job in may this year and my supervisor treating so different it’s way more strict. The only reason I was out was because I had a baby and I had to actually reapply even tho I’ve been there for two years. It’s like I had to climb the ladder again at work… I’m still in the new hire position even tho I been back since may. I’m taking a class now so I can start working in the health field. I’m more excited and motivated when I go to class than I am at work. I don't know I’m ready to just leave. I just feel like I’m not getting treated right
What are signs that you should quit your job?
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