Hello Aspirant,

See for temporary purpose you can use affidavit with your marksheet of class 12th but for very long and permanent reasons you should make necessary corrections in your marksheet. This can be done very easily but it is time-taking process so try to do it as soon as possible. You can make such corrections in your marksheet either through your respective school or direct through CBSE's regional center of your area.

I hope this information helps you.

Good Luck!!