Hey Anil

THis time your rank will be decided by the percentile score not by marks.

And admission is based upon the rank and i think according to the previous year cut offs you should secure atleast 99+percentile so that you secure rank in top 1 percent so that you get civil in NIT calicut( may vary depending upon the other students choices and priorities and your state).

(but your rank may vary and nothing can be said right now).You have to wait till april result for final ranking.

Good luck