As above, there is so much non-standard phraseology in use on the frequencies, you are much better off listening to/reading training material to pass the exam. A lot of the stuff you would be listening to via internet would be IFR anyway and largely irrelevant to the VFR RT exam. Best to learn the exact phraseology (and pronunciation) before getting into any bad habits. For the exam learn your Mayday/Pan calls and the services each type of controller/radio officer can provide, etc.