Nanchong immigrated to Shanghai.

Exactly, based on how many years you went to college there. No matter where your household registration is, a few years ago, in order to prevent immigrants from the college entrance examination, the Ministry of Education issued a regulation that people from other places who take the college entrance examination locally must go to school for two years, otherwise they will be disqualified from the college entrance examination. It is being implemented in many places now, but it would be nice if your household registration was signed in Mianyang. If you don't sign it, you don't know how to stipulate it.