Hey KMR way of life,
No, They will not consider your 12th Marks. Only your Bachelors degree percentage is checked here. Anyways your bachelors degree percentage must be above 50% for general. For SC/ST it is 45%. For more details you can go through following website link,
https://www.google.co.in/amp/s/bschool.careers360.com/articles/cmat-eligibility-criteria/amp
All the best!
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