> She scored 95% in one subject. But the qualified cut-off rate is 98%!
> My eyes just rolled looking at that number. That means they only pick 98 and 99 percentiles.
Either one of these is wrong, or they somehow managed to craft a test where the score percentage matches the score percentile, which while possible to engineer is somewhat improbable and also contradicts the next sentence:
> For a first grader to score that high, she needs to answer the exam perfectly.
Irrespective of one’s current grade level, it doesn't require answering an exam perfectly to get a 98%. It might to get a 98 percentile score (depending on what other people taking the score get).
> If you have some statistics training, you'll see this score is like shooting yourself in the foot.
If you have some statistics training you'll recognize the difference between percentages and percentiles and which of the former corresponds to a perfect score.
The test-retest validity of IQ tests (which tests for gifted programs either expressly are or are equivalent to) is such that it's not unreasonable at all to think that people will consistently score at about the same place based on ability over a short time period (over a longer span there'll be some variation) and that being a prepared test taker isn't a particularly significant factor, though anxiety about testing or the particular test could depress scores and soothing that is the main benefit of test prep.
Yes, the levels most districts use a gifted cutoff are very high (usually 97th-99th percentile). Yes, that means very few (1-3%) will make the cut. No, this doesn't mean the people that make the cut are just test-taking prodigies.