Vaishnavi, I will tell you what all you can do from your second year.
Concentrate on your subjects and try to solve the questions that appeared in previous year papers of your current semester subjects of GATE syllabus. This will give you an idea of how deep you have to prepare for each subject for the exam.
Later after third year, you can purchase any test series of coaching institutes and keep solving them to test your preparation. Whichever topic you find difficult, revise it again and continue solving.
If you are able to follow the above steps properly, then you don't need to join any coaching classes, But in case you face difficulty in doing all this without supervision, then feel free to join some class.
For more tips, you can refer to :- https://engineering.careers360.com/articles/how-to-prepare-for-gate
Feel free to ask if you have any more queries.
Hope this helps!
All the best!
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