Hello student I'm sorry to inform you but with 70. 24 percentile it's really difficult to get admission in any NIT's with OBC category as we all know that seats are very limited and admission is directly based on merit rank.

Cut off vary every year on various factors like level of question in examination seats available and total nunumber of applicants in the entrance examination.

You can check for some private colleges with this percentile. For that use careers360 college predictor to predict college on the basis of marks obtained/rank-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Feel free to comment if you've any doubt

Good luck