Most of the IITs have relaxed their criteria for M.Tech Admissions. Having a B.Tech in ECE from VNIT, try securing a Good Rank in GATE CSE, preferably within Top 200, and you maybe assured of a seat in some of the Top 6-8 IITs in CSE.

For more information about M.Tech CSE Colleges do follow the link below

https://engineering.careers360.com/colleges/list-of-me-mtech-in-computer-science-engineering-colleges-in-india

For more information and preparation tips for GATE CSE do follow the link below

https://engineering.careers360.com/articles/how-prepare-for-gate-computer-science-engineering