Cpl Exams
Firstly i agree with Jay Bo's post. I also received an Isotherm question in the Met exam which was not covered in Bob Tait.
I do however recommend self study and definitely Bob Tait is the way to go as he explains things in plain English and is mildly entertaining at times. ATC is always good if you want more in depth knowledge, however i don't recommend this for the exam as you may suffer a case of information overload.
Just work off Bob Tait back to front and front to back and you'll be fine. Read the CASA questions carefully as they tend to be out to trick you a lot of the times. You have plenty of time allocated so make sure you double check all your answers before clicking the submit button.
Good luck to all