Ca final registration

hey,

i cleared my PCC in Nov 2010, and then i decided to work for a year to have better practical knowledge before clearing  my finals ....but busy with work,i forgot to register myself for the final course.

i wish to know is there a time limit .for.registration in the final course?

i am planning to give my exam in May 2012, by when should i register myself for the final course??

thanks in advance :)