As for tests, they're all inherently biased. I think "test preperation" is bullcrap, because you shouldn't PREPARE for just the test. The test is supposed to test your knowledge of the subjects, not your ability to study for the test.
I agree. I don't know about everyone else but I didn't study a single second for the ACT. If I knew it, I knew it, if not then so be it. To be honest I am not sure how I would have prepared for it.