hi,

tnea counselling is conducts by anna university and this counselling is based on the score of 10+2 marks, students from other state may also participate in this counselling process, if you want to take admission in engineering colleges affiliated by anna university or anna university it self you need to participate in tnea counselling. follow the below link to know more details,

https://engineering.careers360.com/articles/tnea-counselling