Hey

GATE is a national level entrance examination conducted for admission into the M.Tech course and PSUs recruitment .

For any exams, the first thing you should do is to know the syllabus as well as the exam pattern.There are many sites which give the ematerial of many standard books like engineering.net etc

Study the concepts and then solve mock tests. Refer the previous year question papers. Work on your time management.

https://www.google.com/amp/s/engineering.careers360.com/articles/how-prepare-for-gate-computer-science-engineering/amp

Wishing you all the very best.