i have cmpletd my 12th class .i want to take ias coaching along with bsc .in which institution i can join ?

It is of no use to do IAS coaching after 12th. You should wait to complete B.Sc. and then give minimum one year of preparation and coaching for IAS pre- Lim exam. Although, qualifying degree for IAS is Under graduate, many questions in the paper relate to Post graduate courses, so a prudent candidat