Hi aspirant,
In order to be eligible for the CAT Exam, the candidate has to pass at least theirBachelor's degreewith at least 50% (for General Category and for candidates from the NC-OBC caste). For SC/ST and Differently Abled (DA) candidates, the percentage required is 45%. So if you belong from gen category you wont be able to appear for CAT exam.

And for CAt ciunselling 77% is weightage given for CAT score and 10% for 12 score. If you are abke to score great marks in CAT score you may get good colleges.
Visit the following link for more details-

https://bschool.careers360.com/articles/iim-admission-criteria/amp
Hope this helps.

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