you are a pending permanent resident, so you cannot apply for program as a international student. In some universities, they treat pending permanent resident as permanent resident, case by case. Form w-2, vehicle registration, drive lisence and lease agreement are documents used to proof you are a resident in some states. Generally, living for over 1 year can regard as resident. If you are not resident, you should pay out-state tuition in the first year, but in-state tuition from second year. check the website of addmission office, you can find what material you should prepare.