JEE

The school of Engineering and Applied Science, Ahmedabad University allocated seats on the basis of merit of the candidate as determined by the ACPC (Academic committee for professional courses ).

Faculty of Engineering and Technology, Jain Deemed-to-be University, Bangalore accepts UNIGAUGE / JEE / ComedK scores for admissions under their BTech course. 

Yes, you can get admissions in many of the colleges with 83 percentile in JEE Mains such as 

NIT Agartala

NIT Meghalaya

Uttaranchal University Dehradun

Lovely Professional University

Dream institute of technology Kolkatta

According to the latest trends, the cutoff for Computer Science Engineering in IITs and NITs has been around 7000-8000 in the past few years. However, it is important to note that the cutoff marks can vary from year to year. So, it is best to check the cutoff marks for previous years to get an idea of your chances.

You can enrol at the BNCA College of Architecture because your JEE and NATA scores are good (71 percentile and 99 respectively).

It will be a hard race for you because at this percentile, chances are low but Merit rank also matters, you should try for it but not confirmed seat.