Got 230 in JEE mains and 90% in boards. In which NIT I will get mechanical

Hello Ankit, For the list of institutes, you can refer to shiksha college predictor https://www.shiksha.com/jee-mains-college-predictor To calculate your JEE Main rank, you can refer to the below articles https://www.shiksha.com/jee-main-2014-rank-predictor-how-to-calculate-ranks-and-scores-art

You may get top of the NITs like Warangal, Trichi, Surathkal etc in third & spot rounds. All the best.