Dear aspirant, 

Hope you are doing well. As per your query there is only 100% fee waiver in some IIITs not all. This is given in the first year and their are some consequences. It is offered by the State government. Also depending on the results fee waivers are also given in second year though this does not concern every IIIT. You can call the helpdesk or helpline number of the college and they can help you with the necessary. Hope you find this helpful. Thank you.