What I'm about to say is opinion and speculation.
I believe the first two are correct, but there are distinct contexts you would use them in.
"Enrolled in" describes an action one would take. After graduation college, I enrolled in technical school.
"Enrolled at" describes the location of my enrollment, after the fact of my attending school is stipulated. Yes, I'm in school. I'm enrolled at Gofug University.
"Enrolled with" is just flat wrong. Except maybe in answer to the question "do you go to school alone?", in which case one might say, "Heck no! I enrolled with my brother, Jimmy Bob Joe Jim!"
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