Validation of registration letter

Happy but not HAppy (Ca-ipcc II groupStudent)   (26 Points)

01 January 2017  
as nov 16 ipcc was my 8th attempt for ca ipcc 2nd group so please tell me that how can i revalidate my registration letter for apeearing in may 17 exam of ipcc beacause i can't quit from course...... please mention the necessary time to submit the revalidation form for apeearing in may 17 exam ipcc..... :) :(