can I take that psu job after completing my mtech which I have got during the announcement of gate results before joining in mtech for cse branch
No you can't do that. GATE scores are valid for 3 years but they are only for M.Tech admission. For PSUs recruitment you'll have to give the GATE exam again after completing your MTech.
https://engineering.careers360.com/articles/psu-recruitment-through-gate/amp
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