I request you to kindly know your syllabus and try to focus on your core papers .Below is the link given for the complete syllabus and brochure for Cs And It so kindly know your topics which is to be asked for the examination and prepare accordingly from the starting .

https://engineering.careers360.com/articles/gate-syllabus-for-computer-science-and-information-technology

Hello Nirmal,

Preparation for GATE 2019 will require lot of dedication and hardwork to crack the examination. Listed below are some important things:

• Know what's in the syllabus
• prepare a schedule
• check the exam pattern
• solve previous years question papers & sample papers
• Prepare notes while studying
• Revise

Also, you can refer to the following article to know the detailed preparation tips: https://engineering.careers360.com/articles/how-prepare-for-gate-computer-science-engineering

All the best!