@bb10128 That’s a good link, but mostly it’s talking about money awarded. In terms of boosting admit chances, it’s a tough question when speaking of “most selective.” (That really starts with HYPSM.)
@oldcmcalum notes others. But more than enough kids will have a pattern of good achievements. What seem to be smaller efforts (the sort of community service or how a hs kid extends him/herself,) is part of the picture. Holistic.
Yes, to NSLI-Y. Programs where you do something, play a role, have some impact, even small. Not just experience a milieu or culture- or win. Some programs that offer a stipend, not where Mom and Dad pay. But they’ll still scrutinize the app/supp for overall what comes across. Every section matters.
You do not need Intel, Siemens, etc. Most admits at tippy tops don’t have them or never even participated.