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ajluberto, I am not aware whether GMAC updates GMATprep periodiacally, but software database contains a lot more than a single set of questions.
Doing each of the 2 tests in GMATPrep several times should expose you to many question types GMAT can throw at you.
I suspect they do not update GMATPrep in the first place - correct me if I am wrong.
Even if they do, I would bet actual GMAT is updated far more times than GMATPrep.