Bangalore

Hello Sachin, admissions to all the IIIT'S are based on ranking in JEE Mains. There is no other route for admission. As a sample I am attaching a link that will give you all the required information about different aspects of admission in IIITH. Similar is the case for all other IIIT"s. https://www.shiksha.com/university/iiit-Hyderabad-international-institute-of-information-technology-53885/admission
Best wishes to you.

Hello Om Prakash, admissions in UP are made via UPSEE and in Bangalore via entrance test conducted by government & private colleges. You will need to appear for concerned entrance examination for getting admission. Of course, deemed to be universities do not fall under this but then you may have to appear for the entrance exam conducted by many of these deemed universities. Your score in JEE Mains will be useful only in miniscule number of seats. In view of this I would like to strongly advise you to appear for the April and May sessions of JEE Mains examination to improve your percentile. Best wishes to you.