as far as i know Nepal restricts flow of Foreign Currency!! You might need to get approval from NRB saying why you need money and stuff!! best bet would be if you are on F1, show i-20 (copy will work i guess) and get CHECK (payable at US) from local bank (you might still need approval from NRB though). [The same initial process we used while coming here in US]

There might be other legal and illegel process involved do find that out!!