<p>I think Carolyn hit the nail on the head--forget about the percentages, freshmen and sophmores who take the PSAT are too small and skewed a sample to mean much. But taking the raw PSAT scores and converting them to SAT scores, and figuring that most students will improve just because of exposure to more math, more vocabulary, etc. in two years of HS should give you some idea of the tiers of school that might be appropriate to visit.</p>
<p>The college board has a study that quantifies sophomore to junior year improvement if you's like hard stats to extrapolate from:</p>