IIIT Delhi - Indraprastha Institute of Information Technology Answered Questions

As per the previous year of trends, The closing rank at IIIT-D in asked category for outside Delhi candidate for B.Tech CSE was 17288. While in DTU the closing rank was 9349. So you have to score above 98.5 percentile in JEE Main for getting admission here.

Yes, you can. Admission in IIIT Delhi in B.Tech CSE course is done through the Joint Admission Counselling (JAC) by using the JEE Main Paper-1 scores. The eligibility criteria for B.Tech CSE is given below:
Eligibility criteria: 80 percent marks in aggregate for five subjects (including Physics, Chemistry and Math) and 80% in Mathematics in class XII from CBSE Board or equivalent.
So if you have adequate JEE Main score and meet the above eligibility criteria then you can get admission here in the desired course.

I can give you more details about one side.
If you are passionate about computer science and want to do research and create something new, you'll definitely not regret leaving and joining IIIT-D.
You'll get the chance to work at cutting edge things, go deep into computer science and acquire deep technical knowledge of a variety of domains (and the way YOU want them. The curriculum provides a lot of flexibility). If you want to work in the technical industry/research industry and learn, you would not regret joining IIIT-Delhi.
If not, IIIT-D will probably still be a cool (but hard) place to kick it but I'd need more details of what you want to do to be able to comment.