Hello Ranjith, do not worry. Go to your application form and click on "Edit" option. This time enter the exam roll number correctly. The last date for the submission of TNEA application is Aug-16(Sunday). You can edit your application form before the last date of submission. Better be quick and make the changes. Re-check your application multiple times to verify whether all details have been entered accurately. For additional clarification, contact the admission desk for TNEA. The contact details are provided here:

You can also make note of their official website - tneaonline.in

and their email id - tneaenq@annauniv.edu (mailto:tneaenq@annauniv.edu)

Hope it was useful. Stay safe!