This book is most valuable for those preparing for the GRE who are after a plethora of real GRE-like questions (other review books I have used have questions that seem much harder or easier (i.e. not realistic). The major flaw of this book is that it only includes explanations for one of its tests, and also that there are some errors in the awnser key.... at least in the Logic sections.I would still recommed it though, these are the questions that appear on the GRE and the best way to raise your score is practice, practice, practice!