People who rely in 'dumps' tend to flail in the testing center when they encounter questions that make them think, as opposed to regurgitating memorized answers.
The best way to learn is to study and practice. There are some good 'testing engines' out there that are good test prep. My SCJA Exam Questions Book has got great reviews from test-takers, and other companies like Whizlabs have a good reputation.
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