some links

http://www.mba.com/mba/thegmat/teststructureandoverview

http://rapidshare.com/files/31857374/GMAT_OG_11th_SC.rar.html
http://www.esnips.com/nsdoc/d66885d1-8e69-4310-ac78-ba90a4241ad4

http://www.reviewcritical.com/reviews/official-guide-gmat%C2%AE-review-11th-edition

http://pdfdatabase.com/gmat-official-guide-12th-edition.html

http://www.pdfgeni.com/book/GMAT-Official-Guide-11-pdf.html

http://www.pdf-search-engine.com/gmat-official-guide-pdf.html

http://www.peear.com/file_+Official+Guide+for+GMAT+Quantitative+Review+2nd+edition.html

http://gu1337.com/ebooks/184943-official-guide-gmat-11th-edition-rc-sc-cr-extras.html

http://www.filecrop.com/gmat-OG-11th.html

http://www.gettingtogradschool.com/MBA-Business_School/GMAT-Study_Material.htm