This set of 4 videos, should clear most of the confusion regarding how to prepare Gujarati Literature, topicwise booklist etc.
Here is the link: http://www.youtube.com/playlist?list=PL0A116218CF7AB117
Q. Where to find the previous years’ paper?
Answer: This book “Gujarati Sahitya Paper 1 ane 2 by Hiren Dave, Akshar Prakashan”.
He has provided papers from 2001 to 2009. Then visit official website of UPSC, and you’ll get the question papers for 2010 and 2011. Thus you’ve last 11 years’ papers.