Hello Rakesh, I'm also from Kathmandu. Haven't you seen advertisements in Daily newspapers and television? The answer for your question is broadcasted frequently. There are educational consultants all over Kathmandu and even Nepal. Go to any one of them; they'll help you in visa process for any country you choose to study.

I've found list of educational consultants in Nepal here:
http://www.abroadeducation.com.np/consultants/nepal.html. Browse any of the consultancies from the list and visit them for service. But remember, they may charge you for their support.

About visa success, I don't thing applying from India will help you. But give a try and if you succeed, inform me too.