Hi Aspirant!

There is a point by which candidate need to have 75% or more marks or be in the top 20 percentile in Class 12 to get admission in IITs or NITs through JEE MAIN. So this is the relation by which top students get into IITs and NITs. You have to appear in JEE MAIN and come in merit for NIT Warangal. Thus No direct relation with class 12 marks and NIT Warangal seat.

You can also know your rank in JEE MAIN here:-JEE Main Rank Predictor - Predict your JEE Main 2019 Rank - JEE Main Percentile Calculator

All the best!