From your question it is not clear to me why you want to change your name and DOB? However the change in name is quite easy. You want to do an affidavit before a first class magistrate. For the proof you have to submit the copy of PAN card, Adhaar card etc. where you have the correct name. And also with that you have to give an advertisement in popular daily news paper that you have changing your name.
The change of DOB birth also needs same kind of process, but it is more complicated. You do not have specified that if you have a birth certificate or not. If you have such a document you can produce that to change your DOB. Do you have different DOB in PAN card, ADHAAR Card or in your 10th ADMIT CARD. Anyhow the main proof is the birth certificate, as the changes will be made on its basis.