Does anyone know what to prepare to meet the immigration officer at the consulate?

I think the immigration officer sent you a letter asking you out.

When I went to the American consulate, I brought everything.

Physical examination supplies, guarantee, passport, ID card, etc.

You'd better take everything the immigration officer gave you.

You are usually asked, "Who is your sponsor?"

It doesn't seem to cost anything. Only after success does the postal service need money.