Hello Roshan

Yes,there are good chances for you that you will get admission in NITs and IIIT,as per you percentile you rank should be 4,345,you can check previous year cut off of some top colleges here https://engineering.careers360.com/articles/jee-main-cutoff.But you have to wait for the official cut off of these colleges.Also if you want to check the chances of colleges you can get with this percentile,you can use college predictor tool to get the exact result from here https://engineering.careers360.com/jee-main-college-predictor

I Hope This Helps

Best Wishes For You!!