Sorry to hear that! If you are decided to divorce and want to change your status to F1, you should proceed immediately. First, you have to get I20 from the college. They ask for TOEFL and financial documents but making financial document is not big deal. If you have some friends in Kathmandu, they can send you the letter pad and stamps of some virtual finance company. Most of the stationary in Baz Bazar do it. There may be some college which may not ask TOEFL. I know one, Stefen Henegar College. It is in Utah. After getting I20 in your hand, then you apply to USCIS to change the status and it normally takes 3 to 4month.