Your best place to find 2015 past papers of general math 10th class from bise sahiwal board. These old up to date papers can be downloaded or viewed online.
2015 General math Past Papers 9th Class BISE Sahiwal Board Analysis
Campus.pk gives you unique insight into each past paper about what are the top chapters and topics.
General-math Past Papers 9th Class BISE Sahiwal Board