I was a guest student at UZH but left to return to my home school this semester. I already deregistered and left. I didn't do well on one of my exams and the retake happens to be over my spring break when I will be there visiting friends anyway. I was just wondering if anyone here might know if I have to redo the entire visa process, or if I can somehow un-deregister (My B-permit was still valid for 6 more months).
I figured I'd ask here before I called the embassy, since I find people here to be nicer and more patient.

...and your nationality is?