Hey there
It's true that your 10th and 12th marks matters when you go for interviews of colleges but for appearing in cat 50% is what needed and so do not worry you have got marks and do prepare hard for the exam.
Check about cat
https://www.google.com/url?sa=t&source=web&rct=j&url=https://bschool.careers360.com/articles/cat-eligibility-criteria/amp&ved=2ahUKEwiOvsrvzajkAhWrH7cAHbWKBCAQFjAAegQIARAB&usg=AOvVaw1aL49Dq1TPG_GKlvbaQ_Jc&cf=1&cshid=1567100372637
Good luck
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