A particular text or video could be copyrighted, and that would mean that other texts could not be directly based on the copyrighted text. But copyright would not protect the ideas and concepts, nor the teaching methods.
One can trademark the name of the method, so that others could not use it in advertising their own versions. One can create and administer a certification, so that only those going though "authorized" training can get the certificate. If third parties adopt and expect that certificate, it will tend to lock in the version of the training tied to the certificate. SCRUM, inc does something of the sort.
I suppose that if it were adult instruction one could make everyone involved sign an NDA, and treat the methods as trade secrets. But that would be cumbersome, and perhaps offsetting to potential clients. And if a trade secret get out, it loses protection.
I don't know if process patent protection could be applied to a teaching method -- I have never heard of it being done.