Hello student yes) cut off vary every year on various factors like level of question in examination seats available and total nunumber of applicants in the entrance examination. With 70 percentile it's difficult to get admission in IIIT as we all know that seats are very limited and admission is directly based on merit rank.

I request you to please help me with your category so that I can check and provide you with the exact cut off respectively as category plays a vital role in admission.

For more details refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-top-iiits/amp

Feel free to comment if you've any doubt

Good luck