The likelihood of a candidate receiving a call from IIMC depends on a number of variables, including academic record, academic diversity, work history, gender diversity, and the evaluation based on categories (EWS, NC-OBC, SC, ST, PWD).
Being from a reserved category will undoubtedly help you, as will your excellent Expected CAT percentile. The required percentage in undergraduate for the SC category is 55%. Therefore, yes, you have an absolutely good chance of getting a call from IIM Calcutta if your real results match the expected results.