I'd recommend checking out the study guides linked on this page: https://support.google.com/partners/answer/3153810?hl=en
They're intended to help you prepare for the Google Partners exams but I find them to be a good learning resource, in general.
Re: Ebook[ Edited ]
September 2014 - last edited September 2014
Here are the direct downloads in PDF of the study material presented inside Google Partners.
Search Advanced PDF download (available in English only)
Display Advanced PDF download (available in English only)
Fundamentals PDF download (available in English only)
You will need to sign up for Google Partners to take the exams:
Getting started with Google Partners