i have done integrated geology in andhra university , will i be eligible to write the gate exam ?? to be recruited in ongc ..

Hello student if you've Msc degree in Geology then yes you're eligible as eligibility criteria says - Candidates must have passed graduation in engineering/technology or Masters degree in any relevant science subject.
There is no upper age limit in GATE Entrance examination.
For more updates refer to the link mentioned below
https://www.google.com/amp/s/engineering.careers360.com/articles/gate-eligibility-criteria

Feel free to comment if you have any doubt
Good luck