• MBA.com The official website of the GMAT. Another great source for test information, and the only place you can register to take the GMAT.
• Wikipedia Article on the GMAT A great place to start if you have no knowledge about the GMAT; includes information on what is tested, number of questions, scoring, etc.
• Beat The GMAT Blog A great resource for putting together your GMAT strategy. This is the blog I kept while studying for the GMAT myself, and I made thorough entries about what I studied each day. Read through it to get a sense of how I structured my own strategy.
• Reflecting on my GMAT Experience Summary of how Eric prepared for and earned a 720 on the GMAT.
• Teach Yourself the GMAT CAT in 24 Hours Decent introduction to the GMAT.
• Mark Rice's GMAT Help, Notes & Study Outline Great tips for approaching your GMAT study.
• Debriefing from a guy who scored a 790 Incredible overview of this guy's GMAT preparation strategy.
• Ursula's Debriefing - 760 A classic post by a user named 'Ursula' who explains how she scored a 760.
• How to study for the GMAT under one month GMAT study guide for people in a time crunch.
• Last 14 days of study Great advice on what to do in your final two weeks of study.
• Attacking each section of the GMAT Helpful advice for approaching various sections/questions types found on the GMAT.
• How to approach practice tests There are right and wrong ways of approaching your practice tests. Don't simply just take them and look at the score-here are some tips on how to really analyze your performance.
• Taking GMAT with medical condition Interesting post on what steps to take to get additional time/resources for your GMAT if you have a medical condition that qualifies.
• GMAT Hacks Great tutorials for preparing for the GMAT.
• I just Beat The GMAT! Tons of success stories and debriefings from GMAT test takers!

Practice Materials

• Recommended GMAT Books and MBA Books The best books to use for your GMAT and business school prep.
• GMATPrep free practice tests The best and most accurate GMAT practice test simulation. This software is produced by GMAC (makers of GMAT test), and features actual but retired GMAT questions. This is a must download!
• GMATPrep The best and most accurate GMAT practice test simulation. This software is produced by GMAC (makers of GMAT test), and features actual but retired GMAT questions. This is a must download!
• PowerPrep - GMAT Practice Test Software PowerPrep was the free GMAT practice test software that used to be distributed from MBA.com. Beginning in 2006, it was replaced by 2006. Even though this software features older GMAT questions, and the UI is a bit clunky, it may still serve as valuable.
• Poll: Best GMAT Practice Tests? Ongoing poll asking which GMAT test prep company makes the best practice tests. Started January 26, 2007.
• Free Kaplan GMAT Practice Test
• Free Princeton Review GMAT Practice Test
• Free Manhattan GMAT Practice Test
• Free Veritas Prep GMAT Practice Test
• Official Guide 10th Edition vs. 11th Edition These two books are compared, with interesting results on overlapping material between the two editions.
• LearnHub GMAT Question Bank Free GMAT question bank featuring thousands of questions. Registration required.

Study Tools

• Beat The GMAT Flashcards Over 300 flashcards on GMAT Strategy, Math, and Verbal subjects. This is a must download! Review these flashcards daily during your GMAT preparation, and be sure to add your own flashcards to supplement your own study strategy.
• GMAT Practice Grid Excellent grid to help you analyze your strengths and weaknesses in your practice problem sets.
• GMAT Practice Grid with Timer Very cool Excel-based GMAT practice grid that automatically tracks timing.
• manishhemnani's GMAT Practice Grid Another practice grid to help you analyze your performance. Created by the user 'manishhemnani'.
• Error Log Example of an error log created by 'rlvesco7'.
• Official Guide 10th Edition Question Information Grid Handy grid that classifies every question in OG 10 by: question type, topic, and level of difficulty. Unfortunately, I haven't seen a similar grid created yet for OG 11.
• OG 11 Question Types Someone created this Excel grid that classifies each questions in OG 11th Edition. Unfortunately, this document is missing the additional data which classifies each question as 'EASY, MEDIUM, or HARD.' Still, it might be useful.

Test Day Tips

• Details of my GMAT test experience Debriefing of Eric's GMAT test day experience.
• What to eat on test day Being hungry is the last thing you should worry about while taking the GMAT!
• What to Bring to the Test Center
• Materials you are given during the GMAT
• Myth of getting the first few questions correct Great post debunking the myth that it's important to get the first few questions correct on each section in order to get a great GMAT score.
• Leaving Questions Blank on GMAT Excellent data showing that the GMAT will severely penalize you for leaving questions unanswered on the test. If you run out of time, GUESS!
• Running out of time before "confirming" answer Information about this common timing scenario for GMAT test takers.
• Stress Management during the test The GMAT can be a psychologically grueling experience. Learn how to manage the stress from this post.
• Sample GMAT Score Report
• Understanding your GMAT Scores Breakdown of a GMAT score report from MBA.com

• GMAT Math Review Decent overview of GMAT math topics.
• Guide for people weak in math
• Test prep strategies for GMAT Math problems GMAT Math overview by Nova Press.
• Year 10 Interactive Maths Support Material Lessons for 10th grade math topics (pretty much the same as what's tested on the GMAT).
• List of math topics tested on the GMAT

Advanced GMAT Math Topics

• Strategy for picking numbers Great tips from "mayonnai5e" on how to pick numbers for GMAT math problems.
• Angles and Arcs
• The Highest Common Factor (HCF) and the Lowest Common Multiple (LCM) Lesson on HCF, LCM.
• Two methods to calculate total average speed
• Formula for the total percentage change
• Looking for Prime Numbers Nice lesson on how to quickly identify prime numbers.
• Compound and Simple Interest Lesson on understanding and calculating compound interest and simple interest.
• Quadratic Equations and Functions
• Probability and Combination Practice Problems These types of questions appear infrequently on the test, so don't overemphasize studying them.
• Overview of Permutations
• Overview of Combinations
• Permutations and Combinations - Topics in Precalculus
• Two great guides on counting methods and probability
• Probability, Permutations, Combinations
• Permutations Lesson Lesson on Permutations provided by the Mathematical Association of New South Wales.
• The Delta Course Advanced GMAT math course.
• Difficult GMAT Math Problems

Data Sufficiency

• Data Sufficiency Strategy Some suggestions on how to attack DS problems.

• GMAT Verbal Notes
• Ten Best Vocabulary Learning Tips Particularly useful to international folks with limited knowledge of English.
• Common GMAT Words Confused & Misused
• 1400 GMAT Words Nice collection of words tested on the GMAT--very useful flashcard format.
• Litesee GMAT Verbal Tests Online GMAT verbal quizzes. Use as a supplement only after exhausting: Official Guide, Kaplan, Princeton Review, Manhattan GMAT.

Sentence Correction

• Spidey's Sentence Correction Notes These SC notes are absolutely legendary. A must download.
• Sahil's Grammar Notes
• Waqa's Sentence Correction Flashcards
• Rajat-nda's Sentence Correction Notes
• "Cheat Sheet" for Sentence Correction and Critical Reasoning
• Verbal Guide for Sentence Correction An overview of SC grammar.
• SC topics tested on the GMAT
• English Style Guide from SparkNotes Online guide to grammar with quick, easy-to-find answers on everything from commas to semicolons to superlatives and more.
• Grammar Slammer Very useful American English grammar reference.
• HyperGrammar Grammar resource.
• Pronouns with Elliptical Clauses An advanced topic sometimes tested on the GMAT: elliptical clauses.
• Guide to Grammar and Writing Grammar lessons.
• TestMagic Grammar Reference
• Infinitives, Gerunds, and Idioms Cool verbal spreadsheet put together by '4nilesh'.
• The Phrase Finder Resource to look up English idioms.
• GMAT Idioms Great list of GMAT idioms commonly tested in the Sentence Correction section. Download the attachment.
• Brutal SCs A collection of the toughest SC questions.

Critical Reasoning

• Critical Reasoning Strategy - PowerPoint Awesome PowerPoint presentation on attacking CR questions.
• Critical Reasoning Tutorial Critical Reasoning tutorial from PrepForTests.
• Boldface Questions Some info on boldface critical reasoning questions.

Reading Comprehension

• General Strategies for Reading Comprehension Guide for folks who are newbies to RC.
• Eric's Approach for Reading Comprehension A small post that provides an overview of Eric's personal approach to attacking RC questions.
• Tips for improving reading speed Some advice on how to read faster-especially good for slow readers like myself.
• RC Learning Resources Great resource for RC-like articles.
• The New York Times Wide variety of articles; good way to prep for passages in RC.
• The McKinsey Quarterly Nice business articles. Good prep for those RC business passages.
• The Scientific American Magazine You'll find many articles here that are similar to the science passages tested on the GMAT.

• AWA Issue Topics Official list of AWA issue topics from MBA.com
• AWA Argument Topics Official list of AWA argument topics from MBA.com
• GMAT Essays Strategy and Overview Good strategies for preparing for the GMAT AWA essays.
• Analysis of Argument Template
• Analysis of Issue Template
• How to format your GMAT essay Nice guidelines for formatting your AWA essays on the GMAT.
• jangoJess' Analysis of Argument tips
• GMAT AWA example essays from Beat The GMAT Members AlaaQasem started a great thread that aggregates the GMAT AWA essays contributed by Beat The GMAT members and categorizes these essays by estimated score.
• Speeding Reading Test Engine Awesome tool to train your speed reading.

• LearnHub Another great GMAT learning community, with lots of great content.
• League of MBA Bloggers GMAT and MBA blog directory.
• MBA Admissions Wire Very impressive end-to-end journal of this guy's b-school admissions.
• Journey to my MBA At one time, one of the best b-school applicant blogs around. No longer updated.

• Vault/PagalGuy Business School Buzz Book E-Book created by Vault and PagalGuy that provides a fantastic deep-dive profile of the top North American and European MBA programs. I've seen guides like this that have cost $50, but this one is free!
• The Admit Office's Hate List Great article by BusinessWeek exposing what NOT to say in your business school applications.

Business School Blogs and Forums

• Stacy Blackman Consulting Blog
• ClearAdmit Blog
• ClearAdmit MBA Admissions Wiki Nice repository of info picked up by applicants as they've gone through the MBA admissions process.
• Accepted Admissions Almanac Blog
• University of Chicago GSB Forums
• Wharton's student2student discussion board
• Businessweek B-School Forums