Please guide me how can i change date of birth in 10th mark card in karnataka.

Dear sir/Madam,

I am facing issues with my date of birth. The DoB mentioned in marks card is 1993 but my original date of birth is 1995 and i have got the DoB certificate for the same from the tahsil office(1995) . Please guide me how can update the DOB in various marksheets like from 10th to Graduation. I am facing issues with respect to govt job applications and please let me how much time it takes for the correction.

Thank you in advance.