Change of name in cbse marksheet and certificate

Dear Sir, My name is Bittoo Paswan and it’s mentioned in 10th ,12th and B.com mark sheet and certificate (all documents and certificate). I want to change my name to Rajat Paswan. Currently I am preparing for MBA (Finance). Can you please tell me the procedure to change the name in 10th and 12th mark sheet (all Documents) Awaiting for your feedback….Thanks a lot in advance sir. Regards Bittoo Paswan