Could the ACT percentiles be inflated?

Test Preparation
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<p>I said at top scores. The lower the scores, the higher percentile error, but as scores drop on the SAT the percentile difference increases too.</p>

<p>The change always yields around a 8-15 point deduction in terms of SAT score.</p>

<p>I didn’t mean to put the percentile (%) there though.</p>