Hi renu7,
Most of the questions in the OG12 are also in the OG13. The OG13 does include some new material though as well as content for the IR section. If you're interested in more "official material" that you don't already own, then you might consider purchasing the subject specific books (Quant, Verbal) and downloading the practice material from www.mba.com (2 practice CATs and practice problems).
GMAT assassins aren't born, they're made,
Rich
offical GMaT 2013
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