Dear student.

Greetings.

The best way to prepare for GATE examination would be to start shortly after the 2nd year as it contains syllabus from 2nd year. You shoul refer to recommended books for your preparation. 

Thank you. All the best.

Hey ,

For sure,  you should start preparing for it infct you should have started  doing that from first year as it needs hardwork and time. But,  you can also qualify GATE after startig it from third year but only if you have a nice confidence and a dedication to do hardwork.

Yhankyou