My main concern is: If I study from this book, will I be able to pass the exam, taking in mind that the exam is 11GR2 based?
The exam developers work to ensure there are not conflicts of this type in the exam. The exam was made against R1 and verified against R2. When they verify the exam against a later release, what they are really doing is making sure that none of the questions asked are incorrect for the new release. They will not alter answers to make them correct for a later release and incorrect for an earlier one.
You can also find links to certification safe study material (documentation, articles & videos) at the following URL: