Hey,
Generally,you get two-three days time from the day of declaration of cutoffs.
I would advise you take reservation in trains in advance,so that you can reach Delhi on time from Kolkata. While,booking flight tickets in advance is bit  risky because on cancelling the ticket, you hardly get the money back while in trains it's not the case. However,if you can afford you can take the flight and reach on time. But,that entirely depends on your choice.
Hope this helps.

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