would i get an nit for 75 marks in jee main in obc category and i have scored 84.5% in my tamil nadu board exam

rare chances....................

but hope for the best

NO...you can try seeking admission at Lovely Professional University, Phagwara, Punjab..as I have heard it is a very reputed institution, providing quality education and sound placement record....other institutions which may also be considered for admission are – Vasireddy Venkatadari Inst of Tech, Guntur,......Ambala College of Engg and Advanced research, Ambala