Divorce certificate

Q: I have been divorced and got the English certificate and  the Islamic divorce certificate will be coming soon this week. I have known that I have to complete my iddah. I have been separated from my ex husband from april 2015 and applied my divorce on the June 2016. I have not seen him or slept with him. I want to say that do I still need to complete the iddah for three months or do I not have to when receiving the certificate. Can you please reply me. I am kind of confused. Because I have not been with him for more than a year.