The GMAT exam consists of four sections: An analytical writing assessment, integrated reasoning, the quantitative section, and the verbal section

Total testing time is three and a half hours, but test takers should plan for a total time of approximately four hours, with breaks.

Test takers have 30 minutes for the analytical writing assessment and another 30 minutes to work through 12 questions, which often have multiple parts, on the integrated reasoning section and are given 75 minutes to work through 37 questions in the quantitative section and another 75 minutes to get through 41 questions in the verbal section.

As per your demand here I am suggesting you books that you can recommend for GMAT Preparation:

The Official Guide 12th Edition

Manhattan GMAT Set of 8 Strategy Guides

OG for GMAT Verbal Review 2nd Ed

PowerScore GMAT Critical Reasoning Bible

Manhattan Sentence Correction GMAT

Kaplan GMAT 2012 Premier with CD-ROM

OG for GMAT Quantitative Review 2nd Ed

Advanced GMAT Quant (Gmat Strategy Guides)

Manhattan Word Translations

Kaplan GMAT 800: Advanced Prep

Manhattan Number Properties GMAT Strategy Guide

Princeton: Cracking the GMAT, 2011 Edition

Kaplan GMAT Verbal Workbook

Manhattan Reading Comprehension GMAT Strategy Guide

Kaplan GMAT Math Workbook

Manhattan Equations, Inequalities, and VIC’s

PowerScore GMAT Sentence Correction Bible

The Ultimate Math Refresher

Manhattan Critical Reasoning GMAT Strategy Guide

Manhattan Geometry GMAT Strategy Guide

Manhattan FDPs GMAT Strategy Guide