If you still need the answer to this. I have the textbook, and its usefulness depends on what you are looking for.
If you are looking for a more detailed guide than OBU information pack, go for it. It has a wise topic section, which I found to be very useful. However, if you are looking for exemplars and very detailed guidance, I’d suggest pass.
The book would have been great if it highlighted why students fail and how to resolve the common issues, but it doesn’t.