I bought this book from EBAY for my GMAT exam last week. It's the latest edition (released in June 2012), and this version is NOT available in Nilkhet.
The sellers in Nilkhet might claim that they have 13th edition, but that's actually 12th edition. You won't find the original in New Market as well.
The book is ABSOLUTELY NEW condition with NO pen/pencil marks inside. I'm selling it coz I'm finished with my test and I dont need it anymore.
The Official Guide for GMAT® Review, 13th Edition features:
More than 900 real questions and answer explanations from past GMAT exams including 205 never before published
A new online study companion with 50 Integrated Reasoning questions and answer explanations
An Integrated Reasoning chapter with details about the new GMAT exam section
A 100-question diagnostic exam to help focus your test preparation efforts
Grammar review covering concepts tested on the GMAT Verbal section
Comprehensive math review covering concepts tested on the GMAT Quantitative section
Tips to prepare for the GMAT exam
Integrated Reasoning online component requirements:
The online component is best viewed with Internet Explorer 7 or greater, Safari, Google Chrome or Firefox.
The online component requires an activation code. Follow instructions on the inside back cover of the Official Guide, 13th Edition to retrieve your code.
There is no overlap between questions found in The Official Guide for GMAT® Review, 13th Edition, The Official Guide for GMAT® Quantitative Review, The Official Guide for GMAT® Verbal Review, and GMATPrep® software.
The new practice questions in the 12th Edition replace 300 practice questions from the 11th Edition. The remaining questions overlap.