Hi Harsh and Jaideep,
First I get along with Harsh's question... Harsh, I assume your Final year would begin from June/July 2012. The eligibility for CFA Program offered by CFAI, US demands you to be atleast in the final year of your Bachelor's program. This means you may freely appear for Dec 2012 examinations. Best of luck for that... !
Now for Jaideep.... It's good that you wish to appear for CFA examinations but the eligibility demamds you to be atleast in the Final year of your Bachelors degree programme. I suppose, IGNOU has some kind of MoU with ICAI and it treats IPCC passed students as having completed graduation after an examination which the university conducts every year. So If you are not at all registered in any bachelors degree programme please contact IGNOU in this regard for attaining a Bachelors degree without which you will not be eligible for CFA Examinations.