Hello,
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You need at least minimum of 50% in your graduation to get eligible for CAT examination.
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If you are SC/ST  you have 5% relaxation  i.e., you need to score 45%
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If searching for some other information about CAT Eligiblity here is the link I'm providing for your further needs.
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https://bschool.careers360.com/articles/cat-eligibility-criteria

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