IITJEE exam is happening on 8th April, 2012 and the results are getting declared on 16th May, 2012. I hope your preparations are well done for the main examination.
Anyway as an IITian I can tell you to try the AskIITians online test series, this may put you a little more close to your dream college. These test series are researched material compiled by IITians only and you can have the last minute analysis of your preparations done so far.
For Askiitians Test Series plese check IIT JEE test series 2012-2013.