This book is really more of doing and less of theory.
By the time time you finish third chapter you would have already started to learn stuff like Bypassing security measures ( Hidden SSID's and Mac filters. )
I am planning to take OSWP this December, as OSWP needs to setup your own lab and basic linux skills, I bet this book comes really handy.
Before taking OSWP I want to finish the following
CWNA official guide : for WLAN basics
Hacking Exposed Wireless 2nd Edition - Solid book
BackTrack 5 Wireless Penetration Testing Beginner’s Guide book
and Wireless Hacking Megaprimer by Vivek
I think this list would be really enough to get through OSWP course smoothly.
“Knowing is not enough; we must apply. Willing is not enough: we must do.”
- Bruce Lee