If you are not interested in M.Tech and want to go for job then you can give Gate exam to get PSU recruitment as this would be the best option for you. Also, the cut off varies PSU to PSU wise so to check the complete information about PSUs through Gate, how to apply, eligibility and what scores are needed etc you can go through the below links -

https://engineering.careers360.com/articles/psu-recruitment-through-gate

https://engineering.careers360.com/articles/what-are-gate-scores-for-psu-recruitment

Good Luck!!!