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No , science stream is not mandatory at class 12th level to be eligible for bca at christ university.  Basic eligibility for the bca programme at christ university  is a pass at the +2 level (Karnataka PUC / ISC / CBSE / NIOS / State Boards) in any stream  from any recognised Board in India. For more and detailed information go through christ university official website for which link is provided below :-

https://christuniversity.in/sciences/computer-science/bachelor-of-computer-applications-(bca)/250