Correction in cbse marksheet

Good morning Sir/Madam

In all my docs. my name appears as "Ravi s/o Ram Kishan". But now i have to add the surnames and change it to "Ravi Rathaur s/o Ramkishan Rathaur"; also my father's official name is "Ramkishan Rathaur" in all his docs. and IDs proofs. I have consulted many local advocated but they are not sure about how can i add surnames to both mine and my father's name. I was told i need to get an affidavit then news paper publication and something about gazzette notification. 

I need urgent help. Please if  you can help me with step by step procedure in detail. What all i need to do add my surname in all my educational documents. How can i get corrected both name. Please help.