I took a course in Canada, which can be found by searching "dunkyou". It was entirely worthwhile. It has a "ground school" element, which is web based, and very worthwhile in its own right.
I brief all of my pax, and actually go through the motions in the Teal, 'cause it's a little unususal, and they might be swimming while they're exiting. I have the door handle of the 150 boldly labled "EXIT" with a glow in the dark background, and after briefing every pax, I'm always amazed how many cannot remember how to open the door at the end of the flight. I guess my flights must just be overwhelming!
Brief your passengers before the flight, on that very miniscule chance that they can exit, and you cannot....