If you belong to one of these organisations you have 84 days to qualify for IMI certification and why wouldn't you?
Experienced commercial mediators are able to gain IMI Certification via the Experience Qualification Path, and include your Mediator Profile on the IMI Web Portal, without undertaking a test, if you belong to any one of these;
ACB Group www.acb-group.com
ADR Chambers Canada www.adrchambers.ca
LEADR www.leadr.com.au; www.leadr.co.nz