As many times as you want up to you.

GATE exam can be attempted unlimited tunes but for each years score, it shall be only vakid for 3years duration.

Secondly there is no age limit as well.
Detailed criteria for all categories shsredbelow.
https://engineering.careers360.com/articles/gate-eligibility-criteria

Students with BE/MCA/BCA/BTECH/BS/BARCH/BPHARM degrees can apply.
Also students in final year of graduation can apply for GATE Mtech/ME courses.

Dear Siva,

# a number of attempts vary according to your categories(this is wrong).

you can attempt any time after the graduation.there is no limit.

good luck

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