Hello sajalranjan555

I hope you are doing good. I would like to tell you that in 70 percentile you estimated rank would be 306900-345000 . On this rank you hold very low chances of getting any nits at this rank. Their may he have slight possibility if you have home state quota ,you can go through the following link:

https://engineering.careers360.com/articles/low-jee-main-rank-check-which-colleges-you-can-get

You can  also use the JEE-Main College Predictor to predict your chances of admission in different engineering colleges of India :-

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

Hope you found this answer helpful. Good luck for your future