USA nepal, don't lie too them.they already know the reality of nepali students.Everybody loves confidence.just tell them confidently that my brother will sponsor me.i will study there and if I get opt,h1b ,greencard etc I will work in big company .make a lot of money and return back or settle there and contribute to the us economy.if I don't get h1b I will return back immidietly.consoler will like your honesty and plan and give you visa...