These are all the prelim papers made by Pegasys. I have a lot to say about the quality of these papers but in all likelihood they will be the ones making your prelim so these will give the best indication of what yours will be like!
(National 5) 2018 Paper 1 Paper 2 Answers
(National 5) 2017 Paper 1 Paper 2 Answers
(National 5) 2016 Paper 1 Paper 2 Answers
(National 5) 2015 Paper 1 Paper 2 Answers
(National 5) 2014 Paper 1 Paper 2 Answers
(SG Credit) 2013 Paper 1 Paper 2 Answers
(SG Credit) 2012 Paper 1 Paper 2 Answers
(SG Credit) 2011 Paper 1 Paper 2 Answers
(SG Credit) 2010 Paper 1 Paper 2 Answers
(SG Credit) 2009 Paper 1 Paper 2 Answers
(SG Credit) 2008 Paper 1 Paper 2 Answers
I have included these for extra revision. These are all the prelim papers from a wonderful school in Clydebank. I have included them here because they're great and plentiful! Well worth having a click around their website here.