dear riya,

you can rectify it only at the time of correction period if NTA provide this type of correction during correction period.

in my opinion if you not finally  submitted your application till and your are  not able to change the uploaded marksheet then you should fill a new application form by using another email id and another mobile number then you will get the new registration number and the go forward with this new registration number.

and also I want to inform you that upload your 10th marksheet only when your 10th board does not provide passing certificate.

hope this helps.

if you have any doubts please feel free to ask.