<human>: So I had been up late studying the night before my calculus midterm. 

I wake up a couple of hours before my exam starts. For the little sleep I got, I was feeling fairly fresh and ready to go. I commute 50 minutes to class and am seated 10 minutes before we start writing. I like to arrive early and be prepared, you see.

I fill out my name etc. on the exam cover. I don't see my professor in the room, so I assume the people handing out exams are class TA's that I've never seen before.

I write the exam. I am nearly finished it when the ["oh shit" moment, clicks.] I'm taking the wrong courses' exam. 

I was sitting in the room right beside my regular class writing an intro math course. That would explain why only a tiny portion of what I'd studied was on the exam.

I've spoken to my actual professor, so I'm just waiting for their response now.

Condense the text into a few key points
<bot>: I sat in the room beside my actual exam room, taking an exam in a course I'm not in, while everyone else in my class was writing the correct one. [This](