Correction or date of birth in school leaving certificate

Hi sir/madam My name is bhupendra bahadur and i am from bihar. I have passed out matric in 2015 from marwari high school and now i am in B.A part 1 . When i have passed middle school they gave me transfer certificate with dob (10.02.2000) in 2013 and after few months my father made muncipal dob with (10.02.2001) so i have subimitted my T.C in high school before made my muncipal dob . When i have passed out in matric then i have requst them for changing my dob (10.02.2001) in school leaving certificate with the basis or my original muncipal dob.the teacher said that if uuh could issue new T.C f4om your middle school we will change your dob in SLC nd i did that whatever they said bt when i went to high school nd told them for changing my dob nd gave them new T.C they haveny taken that T.C . And now my original dob(10.02.2001) is in the aadhar card,muncipal dob, 10th registration card ,12th registration card nd i want to change my dob in school leaving certificate . So please give me a legal prossess becouse the principal said that can not be changed and there is no legal prossess .