www.cee.kerala.gov.in-On 27 July 2012 KEAM 2012 -- Allotment Cancellation has been published on the offical website
Cancellation of Allotment will remove your existing Allotment as well as all higher order options.
You might be waiting to see the KEAM 2012 Allotment Cancellation.
Please visit the below link to see the Allotment Cancellation
Please visit http://www.cee-kerala.org/docs/keam2012/cap/cancel/allot_cancel_enoti.pdf for more details