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AGDee,
I think they force the scores into a normal distribution after the fact based on the students' relative performance.
The state tests are probably nowhere near as well done as the national exam. Say what one will about the College Board and ETS, they do some impressive analysis of the data, before, during and after testing.
On the Georgia tests, some of the individual questions are really bad; on the other hand, there seems to be a massive curve and the cut score or failing scores are really low, so they don't hurt the kids in that regard.
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