Fatima, 8 years is too long a time. What you need to do is get an Affidavit done with both the names Stating that both the names belong to you and you also go by that name and this name. We are afraid that you cannot change the error in our 10th certificate at this juncture. But an affidavit will help you. That should not be a problem. Any lawyer can help you get an affidavit.