If you have enough time i would definately do it. The more problems the better. If you get through it with understanding everything, it will definately build your confidence.
Some of the chapters are definately better then the others.
But the key to this book is the 6 min. Try to complete them within that time.
There is also a practice exam from Camera, not like the NCEES but also good for confidence.
Don't forget problems, problems, problems. Just keep at it. Any questions you don't get ask some one. they might give better insight, or an easier way to look at it.
You can probably pick this book up from the library, or buy a used one if you don't want to shell out the full cost. Its still worth it.