Hi, aspirant, it is good to know that you really have good marks in JEE Mains and on this rank you could have got not IIIT but NIT for sure but since you don't have 75% in 12th so it is not possible fir you to get into any IIIT's or NIT's so the only option is leftvand that is GFTI's and I'm damn sure if uou apply for counselling on this rank you would surely get any if the best GFTI's(Government Funded Technical Instititions) for sure.

Good Luck.