Hello sanjavi,

if you satisfy all the eligibility criteria of TNEA then only you can appear the exam. minimum required percentage is 45% for general category.  if your exam is late then you will get your result late.

better to write a mail to the board asking to guide you.  to know about the eligibility criteria then click on the link below

https://engineering.careers360.com/articles/tnea-eligibility-criteria

thanks