Dear aspirant,

To be eligible for gate you must have completed your 4 years of graduation if you are doing b.tech. In 3rd year yoh cannot go for the gate exam.

For detailled information you can visit the below link in which you will get each and every information regarding the eligibility criteria for the gate exam.

https://www.google.com/amp/s/engineering.careers360.com/articles/gate-eligibility-criteria/amp

GOOD LUCK.