&gt; (actually 4.8% per google)

That's out of date. Stanford no longer publishes admit rate, but you can assume it decreased commensurate with those of its peer schools (although it's the most selective school, so maybe not quite as drastically). 

To get into those schools you need elite scores plus some other kind of hook, e.g. some kind of passion that makes you special. That said, if you get a perfect score you probably have that.