Need help!!!!

Hi to all frnds and respected seniors!!

This is saurabh goel here. Preparing for CPT December 2011.  My question is that i don't have commerce background and have never been in touch with commerce subjects. I have been a science student  till now. So can you please guide me how can i prepare effctively for upcoming exam??? Is ICAI study material enough for study?? And if not then which books would you suggest me to prepare. I need your suggestion. Pls help me out. Thanks.