Hello Onkar,

With this marks in GATE with CSE branch the chances of getting into a good PSUs is very less as the computer science cut-off bit on the higher side. But if you belong to reserve category you might have chance. But this can't be predicted surely as every year the cut-off varies as the no. Of candidates applying changes and also the paper is tough or easy.

So, this can only be known once the final result is out. Meanwhile you can go to below link to have an idea as which PSU you can apply with this marks 

https://engineering.careers360.com/gate-college-predictor

Hope this will help you. Feel free to ask any query.