Hello Anita

I think you are asking about PSU. If so then let me tell you, to get topcPSU's like  IOCL, HPCL, PGCIL, NTPC, BPCL, ONGC, DRDO which are some of the major PSUs which recruit computer engineers through gate you need to be under 400 AIR. 78+ Gate marks.

If you are under 150 then it's a sure shot, until and unless you totally screw your GD and PI.