hello ravi verma,

so you gonna start from 2nd year.it's a great and correct decision for GATE preparation.to know best books for gate preaparation,please refer this link:

https://engineering.careers360.com/articles/what-are-best-books-for-gate-preparation

from 2nd year, you've allocate some space for this preparation.dont forget that you need to handle both academics and also this.so be scheduled and stick to the plan.

online coaching:if you get a chance to learn for free then you can go for it.if it is being for cost/purchasing,then dont do such a things.

all the best

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Thank you!!!:)