<p>The "point" calculations are not published. Just the relative weights of the big three categories (academic, leadership/ec's and physical). The highest candidate score "wins" but there is a category of points (I forget what it is called) that can only be described by me as "discretionary". If there is one common factor that is shared by most of the accepted candidates (besides having passed the physical fitness test and DODMERB) its that the vast majority have earned at least one Varsity letter (87% for the class of 2008). Keep in mind that leaves only 13% who did not earn a varsity letter and if I were a betting man I would think that of the 13% who did not probably the majority of those came from active duty or the prep school. A myriad of outstanding academically oriented candidates apply, but that Varsity letter attached to their file helps complete the "whole person" in the academy's mind.
All that being said, it's not impossible for someone to be offered admission straight out of high school without a varsity letter, but it is not the norm.</p>