Eligibility for ca final - Urgent query PLS!

Good day folks! Pls solve my small query...

I cleared my first group of Ipcc in May - 2012 (CPT stream) and second group in November - 2013.
I joined for articleship only in December 2012 though i completed my Ist group in may itself.

Am I eligible to write my final exams in May 2015? Some say that we have to calculate only from the date of joining articles. It means my eligibility falls only on november 2015.

I want to know if I can register for and write my final attempt in May 2015.
Pls give me your reply and add valuable suggestions if any. (and ASAP)

Thanku. Cheers! :) :)