Upon my path towards studying for the physics GRE, the only book that I've had recommended is "Conquering the Physics GRE" located here: https://www.amazon.com/Conquering-Physics-GRE-Yoni-Kahn/dp/1479274631 The book is not too expensive, which is nice ($46.00). However, I'm not entirely sure that it is worth the time/money. Does anyone have suggestions on this? Either I will purchase this book and primarily use it to study for the Physics GRE, or I will simply use the vast amount of resources available online (prior GRE tests, etc.).