Hey,

It is totally dependent on you, if you work more and more in your college studies than it would be enough for you but reffering many types of books is always profitable.

Personally speaking for a student in Computer engineering branch college books are more than enough.

Just start practicing on different programs and if you a lot of interest in your field than you can easily crack GATE. There is no need of coaching for GATE studies.

Remember hardwork is definitely important but it can be a waste if you don't do it with your full dedication.

You can go through our link given below where you can find each and every information related to this field,

https://engineering.careers360.com/exams/gate

Good luck!