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Real DAT passages can be a little more difficult since CDR doesn't have a lot of scientific passages. For me anyways, real DAT is always scientific. I wouldn't worry about it too much. Just make sure to really read the passage and focus on it while you're taking.
Yea, I agree. The passages on the real DAT were more science-oriented and dense. But the questions were easier to andwer since they were pretty much all S & D.