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/amp

Feel free to comment if you have any doubt
Good luck

Andhra University, Visakhapatnam

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