Some schools like leadership Some love advanced languages. Then there are major specific strengths. Selectivity with so many random variables is hard to build unless the schools are looking for the exact same students. Cal tech and mit are not looking for the same student as Williams and brown. Some overlap. But one school may be more of a reach for a profile that is much stronger at another with perceived equal selectivity. And knowing your chances are impossible unless you are a recruited athlete celebrity or Uber wealthy benefactor. Harvard as an example in their lawsuit was found to have filled 30 percent of the class from its “connected” pool which accounted for less than 5 percent of applicants. That’s before counting international urm or artistic groups. Music acting published writing etc. the average great white female is competing for 200 seats against the world. Selectivity measures to build accurate expectations are useless for many of the schools