Hello Sunil Gupta

TNEA or Tamil Nadu Engineering Admissions is a counselling process conducted by Anna University each year for admissions into the engineering and related technology courses in the state of Tamil Nadu.

Candidates are eligible to apply for TNEA if they have cleared their HSC (Academic) or its equivalent with a minimum average percentage in Mathematics, Physics and Chemistry.

According to officials it is mentioned that HSC Board or Its equivalent which means that Any recognized board which is equal to HSC Board. so all three boards HSC, CBSE, and ICSE is valid for the counselling process in TNEA.

For more further information check the link given below

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

Thank you