Hello,

As per the official website notification for students getting admitted through JoSAA, you have to submit the remaining academic fees at your allotted institute which in your case is IIIT Trichy. This fees will be apart from the 35000 already paid as seat acceptance fees and that fee will be adjusted in the tuition fees. If you don't want to further participate in the special rounds, you can also get hostel by paying the hostel fee at the time of reporting + admission. 

Hope it helps.