Hello Student
As the time for editing the mistakes in the form you have submitted then you have to contact with the respective authority to solve your problem. Even they donot response on your request then you have to send an appeal for the correction you have made in the form fillup.Still they do not  response on your appeal for mistakes then you have to take the help of affidadivit copy in support of your editing your mistake problem. Now they will response your application for editing the mistake you have done in the form.
Hope this helps.