Hey there
With 76 percentile you have less chances of getting nit Calicut as your percentile is low. NIT Calicut is in top NITs and thus even in ST category your chances are low.
Check the link for detailed cutoff
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-calicut/amp&ved=2ahUKEwjBy4Wfh6npAhVuwTgGHcgJD4IQFjAAegQIBhAB&usg=AOvVaw0V3Ddacay2Ne2Y1ttjsk8Z&cf=1
Good luck
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