Petrochemical Engineering

Academy of maritime education and training university - [AMET], Chennai and VELS University, Chennai are the best colleges in Tamil Nadu for petrochemical engineering.

IIT Madras and Anna University are the good options.

Follow the link below for the eligibility criteria for petroleum engineering (petrochemical engineering is not offered by Dibrugarh University).
https://www.shiksha.com/b-tech/course/b-tech-in-petroleum-engineering-dibrugarh-university-185051

Petrochemical engineering is a branch of Chemical Engineering which deals with operations involved in refining petroleum or crude oil by the use of advanced technology. The course also includes extraction of crude petroleum obtained from the core of earth. Students learn about the mechanism and techniques involved in activities like exploration, production and exploitation of oil or natural gases. After the completion of undergraduate and postgraduate programmes in petroleum engineering, students can work in job profiles like petroleum geologists, drilling engineers, reservoir engineers and production engineers.

Hello Fardin, There is no separate eligibility for petrochemical engineering. It is same as that for other branches of engineering like electrical or civil or mechanical.

He can do AMIE in chemical engineering from Institution of Engineers.
About AMIE: http://www.amiestudycircle.com/about-amie.html