As per the eligibility, You should have a Bachelor’s degree in Engineering / Technology with valid GATE score or a Master’s degree in appropriate Sciences/Management where eligible with a good academic record to get admission in IIT Madras for MS in Engineering. You can also refer below given link for the further information.

https://research.iitm.ac.in/brochure/Admission-brochure-for-Jul-Nov2018ason22March2018.pdf

Good Luck!