SSC don't provide the correction window after the application, so you can't change the information once you have paid the fees. If you have committed such mistake then I would recommend you to give the examination and take a try if laterwards you get the scope to rectify it. Your application will not be cancelled but during verification it can cause problem.

I would recommend you to contact the regional office of SSC and get it discussed with the officials this might help you out.

To know more about SSC GD visit the link below:

https://competition.careers360.com/exams/ssc-gd-constable

For the SSC regional office contacts, visit the link below (Copy-paste the link below on your browser):

https://ssc.nic.in/Portal/RegionalNetwork

I hope this answer helps. All the very best for your future endeavors!