A GRE raw Score is the number of questions you answered correctly.
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Yes.z = (raw score - mean)/standard error.Since the standard error is positive, z < 0 => (raw score - mean) < 0 => raw score < mean.
Yes.
The raw score is any value that is observed.
standard score
There is not enough information to answer your question. To determine a Z-Score, the mean and standard deviation is also required.