Hi TNEA is the admission process where your class 12th marks are used for admissions. However it is ony for Tamilnadu candidates. There are other universities in Tamilnadu like Satyabhama, Sastra, SRM, VIT with their own entrance exams. These are also good. You can check them out.

Hi 

TNEA is Tamil Nadu Engineering Admission, it's not an entrance exam.

The admission in TNEA is on the basis of your class XII qualifying exam.

Refer to the link below :

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