Hmm with statistics it has more to do with how you got about coming to the answer for example if you see the question by looking for the key parts within it you should be able to get a formula to help solve it.
The key part you should remember is always go back to basics first and step by step go up and mark the ones you do know and the ones you don't. This way you can derive where you weakness is.
That book wasn't one of the ones I actually used to be honest my professor from my university made one which consisted of the criteria from my second year and final year for me to learn although it was quite large.
You probably are aware of this or people have told you this before but best choice is past papers with mark schemes get them as soon as possible all honesty it will help the most.
Online gamer eh? must be fun though.
