Hello Aditya

I hope you are doing good. I would like to tell you that at your percentile your estimated  will be around 141000 . At this rank it would be very difficult to get admission in DTU ,NSIT or even at mam with general category. In order to get admission in these reputed colleges your all india rank should be below 20000 . My personal advise is to prepare for next attempt by making a proper roadmap because i think you will need to study atleast 10 hours with pure dedication.

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

If you have any other doubt then you can always reach us to clear them :)

thankyou