Unfortunately, it's highly unlikely that you will be able to give the exam with the original form if you made changes and didn't pay the modification fee.
Most online application systems are designed to prevent unauthorized changes and to ensure data integrity. If you made changes to your application, it's likely that the system has recorded these changes and will require you to pay the modification fee to proceed.
Here are some possible consequences of not paying the modification fee:
To resolve this issue, you should:
Its okay if you made changes in the form but not corrected it or submitted it with fee it is mandatory to pay fees for necessary changes you made into your form.your form will not get rejected.
In your case, if it's showing to pay, then do not pay it your application may not be accepted but your first application form which you submitted is accepted by them as it is.If you still have doubts, then do mail the concern authority.
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