I am damn sure that once you apply for immigration petition under your name, you can't go back to Nepal and If U do while Coming back, Immigartion officers at POE might find out your status and you might get in trouble. So, you have to choose between two options either you apply the immigration petition under your name and get a in-state tuition fees or don't file for Petition under your name and when you graduate, just go through the OPT and H1 and eventually you will have what you need.