Hello dear student,

The PSU's only consider the GATE score of current year . So for PSU's GATE score is valid for only one year and If you are looking for higher education then the score is valid for three years. It is the rare to rarest event that any PSU would recruit on the basis of previous years GATE score. SO it is mandatory to attempt current year GATE to get eligible for the recruitment process in any PSU. I hope this was helpful.

Best Wishes!