<p>Sorry I didn’t make it clear. 16th percentile was for Stanford freshmen students, because 84% who submitted ACT scores got 30-36, so approximately 29 is about the 16th percentile.
(Thanks for pointing it out -.-)
I think ECs and rec do help, but applicants of HYPSM are all excellent students, so they might have the same advantages as you do.
btw, ACT Science has nothing to do with AP science, it is about your understanding of data in.</p>