Changing of First name and Surname to my mother's maiden surname

Hi Sir, I'm 30 years old man and my mother got married again in the year 2003 without taking divorce from my father for which he doesn't have any problem. My biological father never took care of me and my mother either financially or morally and moreover he is staying abroad. He is already married second time and having a daughter without taking divorce from my mother for which my mother doesn't have any problem. My step father has taken good care of me and my needs. Right now I'm going on with my biological surname but now I want to change my surname to my mother's maiden surname for which my step father doesn't have any problem. My step father would love to give his surname but I personally would like to go with my mother's maiden surname. Is it possible to do so? If yes then what is the procedure for the same. I would also like to have all my documents (Aadhaar Card, Pan Card, Passport, Birth Certificate, Educational Certificate) with my new name and surname. I don't want to go on with my biological father's name or surname in any of the above documents. Your kind advise in this regard will be highly appreciated.