hello aspirant,

gate preparation should start from 3rd year of enfgineering. however there are only a few students who can crack gate at the first time of attempt and secure a good rank. most of the cases after passed engineering students take 1 year gap for preparing gate. because to crack a good rank lot of practices is required and its really difficult for that type of preparing along with college lab, projects. i would suggest you whatever you are studying make the concept clear and make some short notes on topics. that will give you fruitful result in future.