Dear candidate

Rank cannot be calculated directly using marks as the rank depends on the various factors like number of students attended the exam and number of students got more marks than you, your category and many others, whether you getting into any NIT also depends on your category if you belong to general category there is no chance for you getting into an NIT and if you belong to any other category mention it so, that I can tell you whether you can get into a NIT or not.

Hope this Information is Helpful.