History students generally get the short end of the stick when it comes to practice papers because of copyright issues. I did this for Modern History so here's a compilation of sources for History Extension past papers.
2017
Question 1: N/A
Question 2: N/A
2016
Question 1: Available
Question 2: N/A
2015
Question 1: N/A
Question 2: Available
2014
Question 1: N/A (but if your school has the History Extension NESA Exam Workbook, the source will be available)
Question 2: Available
2013
Question 1: Available
Question 2: Available
2012
Question 1: Available
Question 2: N/A
2011
Question 1: Available
Question 2: N/A
2010
Question 1: Available
Question 2: N/A
2009
Question 1: N/A
Question 2: N/A
2008
Question 1: N/A
Question 2: Available
2007
Question 1: Available
Question 2: Available
2006
Question 1: Available
Question 2: Available
2005
Question 1: Available
Question 2: Available
2004
Question 1: Available
Question 2: Available
2003
Question 1: N/A
Question 2: Available
2002
Question 1: Available
Question 2: Not a source-based question
2001
Question 1: Available
Question 2: Not a source-based question
Anyway, hope this is of some use!