Hi Ujwal,
Your marks in class 10th and 12th are considered at the time of final merit list in IIMs and other top B-schools for admissions. However, you must have at least 50% marks in graduation from a recognised board in order to be eligible to apply for CAT exam. To know more about CAT 2018 Eligibility , explore the link given in the text.
Hope that's helpful. All the best.
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