Hello Aspirant,

Generally no correction charges are there for correcting any kind of online form.

But, if you're changing your domain subject (which I believe would be the subject you're seeking admission in) then NTA would charge you according to different course fees.

Suppose you have applied for a course which has lower fees and want to change to a course with a higher fees. NTA will accordingly utilise your earlier payment and ask you to pay the remaining amount.

Hope this helps!