Hey there, you have scored 40747 ranks in JEE MAINS and you also scored 93.7% in Class 12 Boards. Sorry to say but you will not be able to get admission in any IIIT and even not in GFTI for CSE Branch. But yes at this rank you can get admission in a good college. 

I would rather suggest you check the colleges available for you at these marks at College Predictor at Careers 360 only and it will be very helpful for you while getting a seat there. It will be very helpful for you as it will show the best colleges available for you according to your category and even home state rank.

https://engineering.careers360.com/jee-main-college-predictor?icn=jee-main-clgpd_landing-page&ici=prediction-section_c360-home