The test does mimic real life radio, albeit in a very accelerated manner. But it depends what you're accustomed to.
While I'm confident entering and exiting controlled airspace I've never penetrated a MATZ, or transited controlled airspace, mayday relays, given a "correct" position report, asked for a QDM etc. I was thinking beforehand the training and test would have been much easier. (as most seem to!)
It goes to show, you don't know what you don't know. I found the training and test very worthwhile and interesting - not just a tick box exercise which seems to be so common.