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The GUI look may be different but the methods and logic to manage your cloud is more or less same. What I would suggest is that, you first do some hands-on at http://trystack.org/ this will make you aware of the dashboard basic working. Create some networks, virtual routers and launch your VM.

Next thing I would suggest that get familier with openstack command line interface thoroughly as thre are some task can't be done form dashboard. For this you either join a training center and or go for some internships. And yes COA exam conducted by Openstack Foundation nowadays uses Newton Release to test the candidates. Openstack CLI is more or less the same if you migrate from one OS to another.

To pass the exam with a good score at least you sould have 3 months hands-on practice operating a cloud.

And if you wanna go for vendor based exam RED HAT is best.

All the best for your prepration !