DOB Differs in Birth Certificate And 10th Cbse Certificate

I am joining Merchant Navy, for which passport and CDC(issued by DG shipping corp of India) is required with same DOB.
My DOB in 10/12 cbse certificate is - 07/12/1992
Birth Cerificate - 09/07/1991

For passport birth certificate is required, and for CDC 10th class certificate is required. This difference of DOB in 2 documents is creating problem in my visa.

So What to do ??
Q-1
Can civil court issue instructions to change DOB in CDC(issued by DG Shipping Corp Of India) as per Birth Certificate??

Q-2
And for changing 10th class DOB there is time bound of 2 years in cbse, after that you cant change. I passed out in 2008 already.Can cbse change it now ??