Hey!
GATE (XH) paper- humanities and social sciences consist of general aptitude and reasoning and comprehension (as mandatory subjects) and you can choose any subject of your interest from economics, english, sociology, psychology, philosophy and linguistics. And the syllabus for optional subject section mostly contains the topics from the undergraduation degree, you can check out the syllabus at official website. Also, as you said this is occurring for the first time, so you cannot have any previous years papers for any idea, but GATE has released some sample papers to students which they can refer to get an idea about the exam pattern, type of question asked etc. Also, try to solve these sample papers by considering a stopwatch with you so as to check your time management. And for aptitude section you can refer to the RS Agarwal quantitative aptitude book.
For more info, visit here:
GATE exam 2021 humanities and social science paper details, Check here (careers360.com)
Thankyou
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