Hello aspirant,

Yes it is possible to appear in gate after completing your MTech degree.

Since you have mentioned clearly that you want job in PSU ,Gate becomes mandatory for your selection process.

I would suggest you to appear for GATE and apply for job.

ALL THE BEST FOR YOUR SUCCESSFUL CAREER.

Yes you are eligible for giving GATE exam, here I am attaching a link were you will find all the eligibility criteria and many more information about GATE, so go through it for better idea.

https://engineering.careers360.com/articles/gate-eligibility-criteria