Audit amendments applicable for ipce november, 2012.

Hi guys, Happy Independence Day to all. Could any of you please tell me whether I need to buy the latest version of Surbhi Bansal's Auditing and Assurance book for IPCC. I'm due for IPCE this november and I have the 7th edition of the Audit book mentioned above which includes all amendments upto 1-4-2011. Were there any relevant amendments after that date? If so, do I need to buy the latest editions or can I download the changes from somewhere?