Your best place to find 2015 past papers of islamiat elective 11th class from bise sahiwal board. These old up to date papers can be downloaded or viewed online.
2015 Islamiat elective Past Papers 11th Class BISE Lahore Board Analysis
Campus.pk gives you unique insight into each past paper about what are the top chapters and topics.
Islamiat-elective Past Papers 11th Class BISE Lahore Board