Hello Aspirant!
If you have just registered for the exam and have not submitted the final application form after filling all the requisite details, you can newly register for it using a different Contact no. or E-mail ID.
But if you have done the final form submission, then you can make this correction in your name only during the correction period or when the application form correction window will open for the exam. As you have not provided any exam name, it becomes difficult to give you probable dates for the correction facility. Most of the institutes provide this chance.
Or you can also send an e-mail to the account provided in its official website/help desk to contact the concerned authority and then ask for the same.
Hope you will find this answer helpful.
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