Hey garima!

A small mistake now can be a big mess tomorrow. So , it is better to correct your mistake now only. In your case , i would suggest you to fill a new form with all the correct details carefully and the other option is to contact the exam controlling authorities , which may take some time and also not safely beneficial.

So , the best option is to fill a new form.

You can know the stepwise procedure of filling the form by following the given link :

https://law.careers360.com/articles/how-fill-du-llb-application-form