GATE CSE becomes more tough not only due to the vaste Syllabus, but due to the High Competition across India. A strong test taking strategy as well as a Good and regular Test Series are highly required, provided you are done with the Preparation and Syllabus Revision. Nowadays, besides offline, you have many Good Online Resources to GATE CSE Preparation, like Unacademy, Byjus, Gate Academy, Career Launcher, Etc. Hence, you may devise a strategy taking preparation online and parallely a Test Series Offline or maybe Online as per your Covenience.

For more information about how to prepare for GATE CSE do follow the link below

https://engineering.careers360.com/articles/how-prepare-for-gate-computer-science-engineering