If you're that concerned, call around.
I was in the same boat 2 summers ago. I called RTI in July and they were booking classes in SEPTEMBER.
I called Humber and Centennial and managed to get a spot @ Cent that same week so I grabbed it.
I don't know how anyone can tell which school has the shortest waiting list. It would depend on the number of classes and how quickly they fill up.
You mentioned RTI, Sheridan and Humber. Centennial College also offers classes, as well as Learning Curves (in Seneca's Newnham campus).
There's a thread on courses. HERE
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