Central Board Of Secondary Education [Cbse] — change in name in cbse 10th marksheet

I have passed my 10th exam from cbse board on 2011-12 and now due to some personal reason i want to change my name in 10th marksheet. I have gazette notification, news paper ad., affidavit regarding chnage in my name. Am student of shri shankaracharya vidyalaya, hudco, bhilai, chhattisgarh (491001). I want to know about the complete procedure of change in name in 10th marksheet