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official, great, online, free and good.
If you must use other materials for test strategy, then that's fine, and in most cases necessary, but try your best to stick to official questions whenever possible
Pro tip: you can take each of the 6 gmat prep cats more than once, because the gmat is an adaptive test (it adjusts the difficulty level of later questions based on your previous responses)
And the questions on the test are “front-loaded” so that the first 1/3 of questions have a much larger impact on your score than does the final 1/3 of questions
If you do run out of official gmat prep computer tests (the first two are free, and you can buy four more from gmac), then i can recommend the manhattan gmat cats (computer adaptive tests)