I think the larger issue is that no one can truly say because the applicant pools are extraordinarily talented and no one outside the school knows exactly what a given school wants and needs in a given year.
GPAs, SSATs, ECs, etc. should - IMO - be thought of as things that might preclude you, but will definitely not guarantee you anything. So if your SSAT %ile is 20 points below the average in the schools you’re shooting for, work on that. But if you’re in line to slightly higher, don’t waste effort trying to go from a 94th %ile to 97th. Won’t make a difference.
Check out the various ‘decisions’ threads where kids post a rundown of their profile. Not just stats but subjective opinions of their essays, interviews, etc. Then look at where they were admitted, rejected, and wait listed. It should be enlightening and I mean that in a good way! There are always surprises in both directions…“that kid got accepted to XYZ?!?” as well as “that kid got rejected!!!”
Pursue a passion (or two), go deep, and stand out. How will the AOs refer to you in shorthand (e.g. “the Eagle Scout tuba player”)?