First of all you will have to understand that jee advanced 2017 was among one of the easy papers given in jee advanced also there were many errors in it so there were a lot of bonus marking which resulted in a sharp increase in cutoff as well as marks which a candidate scored due to heavy bonus marking. Hence at 45 marks it is very difficult to even qualify for being included in the rank lists moreover you may not even qualify under your category so in short it is very tough to get any iit at these marks despite your category.