I score 62 marks in gate 2017 in civil engineering...chances of Job??

The score is good so it has good chances for the same. But GD/PI also carries 20-25% of weightage to get recruited in any of the PSU. So better to prepare for it very well this will increase your chances to get job there. And as of now, many PSUs are closed with their application forms, I hope you have applied for them as well and to know what all PSUs are still left or going on with their application dates you can check below article and accordingly you can apply -

http://www.engineering.careers360.com/articles/psu-recruitment-through-gate-2017

Good Luck!!!