I got 143 marks in jee mains and i am obc category and my AP board marks is 94%,so can i get seat in nit surat for mechanical branch.

Hello Himanshu, 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-

You will get NIT- Imphal, Aizwal, Shilong, Srinagar or NIFFT Ranchi for sure if you compare with 2013 seat allotment. You might get Surat also in 3rd or spot round. All the best.