Hello,
Your marks are quiet good. As you belong to SC category, it will give you an advantage to clear CAT as the cutoff is less for SC/ST category. However for IIM Calcutta, the cutoffs of previous years papers were 70 percentile for SC category. But remember cutoffs do vary every year and depend on the toughness of paper, the no of candidates appearing in it and so on.
All the best.
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