Hey Aravindhan

27 percentile is very less score.

And it can not say how much marks you scored because percentile is relative number you scored out of all the students means ( if in your slot if highest marks if 300 than he got 100 percentile marks)..

So 27 percentile means 73% students are ahead you who score more than you and with this percentile you cannot qualify for nit.

So try to prepare yourself with next attempt 

Good luck