Hi Chetana,

GATE is one of the difficult competitive exams in our country and to qualify for it, you need an exceptional score. If you are someone aiming for jobs, you need to be atleast among the top 500 ranks. 

One section of the prescribed GATE syllabus for CS branch is C Programming, which makes it important for you to know programming well. Tricky questions can be asked which check your programming concepts. In case you feel you are weak in it, you should practice it more. If it's still a problematic area, you need to ensure that you are expert in all the other aspects of the syllabus so that your marks aren't affected much.

Please go through this link to know the syllabus-

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

All the best!