Teaching English is more than just being able to speak it.
I have no teaching English experience and this preparation helped me realize that it is not just a matter of being able to speak English. There is much more to it: there are techniques to be aware of, methodology, terminology, and no room left for improvisation. With concrete examples through the modules, I now roughly know what to expect during the CELTA course in July and find it reassuring.
I certainly would recommend the TEFL Preparation Course to all those, like me, who have never taught. Our working experience can help in front of a class composed of workers as we were in a recent past.