As per Regulation 50 of the CA Regulations, 1988, a student will be eligible to appear in Final Exam, after completing of 30 months (2 Years and 6 months) of article ship.
As per this you will be eligible for May 2016 attempt.
25 November 2013
have you received confirmation from icai that your articleship registration successfully completed . . in my opinion . -those who completed both groups and joined articleship have to register for ca final along with articleship registration,other wise icai keep their articles registration pending . .-those who started articleship after group-1 and passed group 2 later can register for ca final at any time . . but recommended to register for ca final atleast 12 months before exam