Constantly exaggerate your mirror checks. Run a counter in your head, 10s max between checks, the more the better. When I took my M test I mirror checked so frequently I felt like I wasn't paying due attention to the road ahead of me. You know what? I still got dinged for not checking enough. The idea of putting a stripe on the back of your helmet is excellent advice. Do that for sure.
Also, take it in Aurora if you can, the route is simple, the highway time is straightforward, and you'll be able to understand the radio instructions. Personally I have trouble understanding thick accents, especially on the phone, so I couldn't imagine trying to understand them over the motorola radio.
Oh, and bring a really thin toque or something that fits over your ears and under your helmet to hold the ear piece in better.