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B.Sc Computer Science is a three year under graduate course. The minimum education qualification is that you must have passed 10+2 with Mathematics, Physics and Chemistry from a recognised board. Your admission depends on which institute you wish to join? What is the eligibility criteria specified for admission to B.Sc Computer Science course in the institute you wish to seek admission? You haven't mentioned any institute in your query hence it it difficult to predict if you are eligible to get admission. Click on the link given below to check the list of institutes offering the preferred course. You may then check the details of the institute in which you are interested to seek admission, check the eligibility criteria and admission process for admission . https://university.careers360.com/colleges/list-of-bsc-in-computer-science-universities-in-india

The minimum percentage requirement is different for each institute so you need to check the eligibility criteria before applying. Also check if the minimum percentage requirement is the overall percentage that you need to score in qualifying examination that is 10+2 or must score minimum marks in each subject in the qualifying examination.