I live close to Clinton, did my M2 there and the place was van load after vaan load of people from GTA area doing their full G, but I asked the tester and he said they don't do full M there because of the highway portion, I asked why cars and not bikes and he didn't really have an answer. Now that was 3 years ago but I would call and ask.the drive test in Clinton is your friend
here is a list of all the drivetest locations
do it in the country side (Clinton location is preferred by many)
http://www.drivetest.ca/en/bookatest/pages/locationfinder.aspx
I must say I and the rest of my group were shocked and the amount of van loads that came there from Toronto, and not to sound nasty but they were all of an east indian decent, and apparently the company that drings them there also does their driver ed, and charges them a small fortune to come all the way out there.
Quick story from the day of doing my test, our tester set up all the pylons for us and after the first there of us did the serpentine a lady and her tester pulled out and she drove right over every single one of our pylons, and her test continued. We were all like WTF.