In the US Military, most of the branches have different qualification tests to become an officer. Officer Candidate Tests for Dummies attempts to prepare the reader to tackle the common elements between all of the tests. You won't find much in this book about the flight and navigation questions you'll see in the Air Force, but all of the English, math, science, mechanical, and electricity questions are all explained here.
On top of that, OCT for Dummies provides tips on how to take tests, best discern word problems, study effectively, and navigate the questions. Not only is this book a resource for those wanting to become an officer, this book is just as good, if not slightly better, than the couple of ASVAB practice books I've read. Since US Army officers take the ASVAB as part of their OCT, a potential enlisted person should read this book as well before taking the ASVAB.
Read more, so I can explain.