American immigrants apply for grants and return home one year later.

1. Yes, you can apply after one year. The situation in different schools is not the same. Some schools can apply for grants if they have not lived for one year, and some schools do require to live for one year before they can apply.

I suggest you buy a plane ticket after June 8.

3. After one year, the cost will be converted, but you should also take the initiative to report to the school.

In addition, regarding fanancial aid's application, I want to say that according to the speed at which you get the green card, you either have a strong responder or you are an investment immigrant, and it is not easy to apply for financial aid in either case. I suggest you consult the school in advance.