I'm from Nepal. I living India almost 10years Tamil Nadu. Now I'm going to 11th std. School principal can accept my community certificate of Nepal
Your school will not accept community certificate of nepal because in india the community certificate which is accepted is issued only by government of india for any category and it is only for indian citizens.
Since you are a Nepalese citizen and you have your community certificate of nepal you are not eligible.but still you can get admission in unreserved category.
Hope it helps..