I can understand a knowledgeable parent's frustration with teachers that just follow the proscribed texts/answers, however, would it not be a good idea to raise it with the principal? Or send letters to the Education dept for your state? Maybe a letter to the minister for your region?
perhaps that is the only way to get action.
When errors are found then either the textbook needs to be changed (probably one or two years down the track) or an addendum provided by way of simple print outs, even if it is only for the next year's class...
getting accurate information to schools and classrooms cannot be that hard in the age of information technology.
There are several thousand members on IIS- maybe get together and make a petition...
or perhaps parents do kick up a stink and the media just does not report it...?
