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GATE syllabus for CSE is based on the undergraduate engineering course. The syllabus for GATE exam for BSc Computer science students is the same as it is for CSE students however generally CSE students have an upper hand in GATE  due to the structure of the syllabus. To get an idea on how to prepare for GATE you can click on https://engineering.careers360.com/articles/gate-syllabus-for-cse-computer-science-engineering