Prior to final selection in a job the Government or otherwise, all the certificates acquired by an aspirants are thoroughly examined and in case of discrepancy, they may be deprived of the oppurtunities. Hence, the corrective step in this regard is essential prior to attending any interview.
You may approach the authorities of the school indicating the descrepancy present in your certificate in the application and finally the same is to be forwarded to the office of the Board from where you have passed the said examination. You would get a fresh certificate after the same being corrected. Afterwards, you have to approach the rotary magistrate of your area for the final approval that you are the bonafide candidate. Later you have to display this advertisement in some local - paper apart from the leading English Newspaper.
These process may be time consuming but this would offer you a permanent solution.