Find the teacher in charge of relocation in the college,

I should have seen it when I graduated. (You can ask your tutor if you haven't seen it before)

Put forward the request of moving back to the place of origin,

Give him an old immigration permit,

He'll do it,

I'll give you a new immigration permit when it's finished.

If you are a fresh graduate,

The school teacher doesn't pay much attention to you,

You have to go to the police station yourself.