Hello Priti,  Look,  NTSE cut offs changes every year depending on various factors like number of students appeared for exam,  Number of scholarships offered for this year,  maximum marks achieve by student and many more factors. But you can predict your chance of selection based on last year cut off. As per the last year cut off students with more than 150 marks got selected for next stage in OBC category. So as per last year cut off you have good chance to get selected for next stage of NTSE.

but remember cut of may got change.

I hope it will help you more.

thanks.