One thing again that I seem to notice on here, people studying without the recommended textbooks
If books are recommended, it is so for a reason ....they help you understand what you are meant to learn and help you with assignments.
How can one study a Cert III or Diploma without the books??? Nothing will make sense.
Books can be costly but if bought online or second hand they are very affordable.
Personally I always get the books, I got mine for my Diploma, never needed to use them but I got them regardless because you never know what book may come in useful during your career.
I have a big collection of Montessori books and am building a collection of other books and resources helpful to me as a GL.
In short GET THE BOOKS