My uncle has an American green card. Can I apply?

No ... you still need to get a visa ... and then apply for a green card in the US government ... It's a complicated process. ....

But ... even if you don't have a green card ... you can still go to public schools in the United States ... only the visa problem will be more troublesome. ..

If you want to go to a one-kilometer high school ... you should choose a good state ... a good area ... because this is the nearest school. ..