Cpt to ipcc- (no direct entry)- revalidation to ipcc

HI Guys, I am an IPCC student coming through CPT the earlier scheme by completing ITT and orientation program. The last time i had appeared for the exam was about 2.5 years back and would like to reaapear. 

Since, am working full time it would be difficult for me to be a part of the direct entry system and appear for articles. Can i still be a part of the old scheme, where I could give my May 2015 exams and then after passing IPCC appear for articles. Do, i need to revalidate my registration for IPCC since its been 2-3 yrs. Kindly, guide me in this regard.

Thanks in advance.