GATE examination is a examination which gives you scope to go for different MTech and MS courses as well as it offers jobs to PSU's. So clearing the examination of GATE can be doubly beneficial for you. Now as you said you are in the first year, its a good time for you start preparing. See in general, in the gate syllabus you will have the most of the syllabus from your BTech/BE course curriculum. So just download the curriculum and start studying the courses you have in your 1st year and in your GATE as well. If you go like this then by the third year of your BTech you will cover really a good amount of the syllabus which is great. Now if you wish you can also take tuitions or can study yourself. Also there are numerous groups available online in different platforms, which provides free materials regarding such examination, you can use them as your self study materials. Keep in mind for examinations like GATE you have to know the concepts very well and have to practice a good number of problems on it.

For GATE preparation tips visit the link below:

https://engineering.careers360.com/articles/gate-preparation-tips-from-toppers-and-experts#:~:text=Keep%20changing%20the%20topics%20after,add%20short%20breaks%20in%20between.&text=Time%20management%20is%20the%20most%20important%20factor%20in%20GATE%202022%20exam.

I hope this answer helps. All the very best for your future endeavors!