I wouldn't sweat it. The percentiles are constantly recalculated based on the pool of people who take the exam. The trend has been shifting towards more international students who are very good at math -- and so the number of people scoring very high in math has increased relative to the past. Hence, to score at the 80%ile more -- requires a higher and higher raw score. It's not surprising to see what used to be an 80%il score is now a 79%ile.
Your score is competitive at this range -- and you
...
Your score is competitive at this range -- and you
...
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