ITT and OT and Advanced IT Training are different things and it seems that you have completed your ITT and OT in ipcc itself,
So as of now you don't have to complete it once again, submission of exam form with duly certificates will do the needfull at the time of Exam form application.
The GMCS which you are going throgh/ have completed by this time, is mandatory (twice in the course of 3 years of articleship)for those who have started Articleship after 1st may 2012.
Once in 1st year of article and second one in betweeen anytime after 18th month-36th month.
Advanced IT training is also made compulsory for those who are registered for Articleship on or after 1st August 2012.
This Advanced IT training is to be persued in the last year of articleship.
Further any kind of notification till now is not out by the ICAI in this regard.