Hello student as per the eligibility criteria you must passed study from class 8 to class 12in Tamil Nadu or you must be a native of Tamil Nadu and you've studied from other state to be eligible for appear in TNEA counselling.

So if you're from outside I'm sorry to inform you but you're not eligible to appear in TNEA counselling.

ELIGIBILITY - Candidates must passed or appearing class 12 in physics chemistry and Mathematics with minimum 45 percent marks aggregate from a recognized board.

For more details refer to the link mentioned below -

https://www.google.com/amp/s/engineering.careers360.com/articles/tnea/amp

Feel free to comment if you've any doubt

Good luck