by RonPurewal Sun May 11, 2008 1:28 am
it's a great resource.
however, it's meant to be used in tandem with the official guides (yellow 11th edition and purple verbal supplement); the idea is that you should use our guide to brush up on the fundamentals of sentence correction, and then do the practice problems out of the official guide once you've built up a decent foundation of knowledge.
our book separates the problems in the official guide into categories based on their content, so you'll find it handy in organizing your studies.
good luck!