Hi.
In this official document (https://ncert.nic.in/pdf/programmes/NTSE/LO_list_2019-20.pdf) is a list of presiding State/UT Liaison Officers along with their contact information. Since there are no clear instruction on changing the error occurred digitally, I can only request you to contact the presiding officer and explain your problem and get the required help in person.
Best of Luck.
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