A particular number can not be given to you because marks clearly depend on the difficulty of the question paper (Since there are eight slots and each slot will have a different question paper).

However you can refer to the ranks instead of Marks. To get an idea about opening and closing ranks to get into an IIIT. kindly use the links provided below:

https://josaa.nic.in/Result/Result/OpeningClosingRankArchieve.aspx

https://josaa.nic.in/webinfocms/Public/View.aspx?page=71