GRE is offered by the Education Testing Service (ETS) and is used by most graduate and business schools worldwide as a common evaluative score for international students. The test is divided into three sections Verbal Reasoning, Quantitative Reasoning and Analytical Writing. Best and worst GRE Prep Material
To prep for your GRE, we have listed some books that we feel will best equip you to master each section of the test, offer strategies for being successful before and during the test, and also provide you with practice questions to get you ready for test day. Best and worst GRE Prep Material

ETS: GRE The Official Guide to the Revised General Test
This guide includes four complete real tests (two are available using the included CD-ROM), hundreds of genuine test questions, thorough descriptions of the Verbal Reasoning and Quantitative Reasoning Content Areas plus tips for answering each type of question. It also contains an overview of the two types of Analytic Writing Tasks you will see on the test, including scored sample replies with actual raters’ comments.
Pros -The only official guide to GRE, it is one of the most authoritative text to refer to as it is designed by the company who creates the text. It is very trustworthy source as it can guide you to what you should be expecting in the exam. Best and worst GRE Prep Material

Manhattan Prep
It offers a wide range of products that will help you to prep for your exam.
Pro – Their comprehensive material is compiled of 8 test taking strategies that emphasise on areas like Algebra; Fractions, Decimals, Percentage; Geometry; Number Properties; and Word Problems. Also a noteworthy addition at the end of each book is that they have three sets of practice questions that are arranged according to their level of difficulty—easy, medium, and difficult. Best and worst GRE Prep Material
Cons – As the guide is detailed, it cannot be used for last minute prep.

Kaplan’s GRE Premier 2016
Equipped with strategies, test taking instructions and practice questions, this guide also comes with six full-length practice tests (five online, one in the book), a digital iPad download, a DVD, a mobile application and access to an online question bank, all of which make studying easier.
Pros – Giving you access to more than 2200 questions; the books are a wealth of test taking strategies that will simplify taking the exam for you. They also provide a 500 question online Quizbank and support from instructors through their Facebook page. Another feature that makes them a popular choice is a guarantee that using their resources would help you score higher on the GRE General Test or they provide a full refund to the student.

Barron’s GRE: 21st Edition
A well-known name in the test taking industry, this book comes with one diagnostic test and two full-length models of the actual test structure. You also get access to their online GRE Course material which comprises of video tutorials, quizzes, a practice question bank, and an iPad study app.
Pros – Well explained answers to the samples tests are provided, which helps in better assimilation.
Two books to not refer to –

McGraw-Hill’s GRE 2014 Edition, McGraw-Hill’s Conquering the New GRE Math, McGraw-Hill’s Conquering the New GRE Verbal and Writing, McGraw-Hill’s 6 GRE Practice Tests
Contain very basic and non GRE like questions, which will not be of any major help in exams. Will only be able to help you master the basics and not ace the more complicated concepts.

Gruber’s Complete GRE Guide 2015
Not a very appealing layout, and the content is also not up to the mark that you would see in an actual GRE exam. Again very basic mastery can be achieved, but not recommended for serious GRE takers.