@oak2maple I know this thread is a few months old, so dunno if your still looking, but here’s some thoughts.
“Top Schools” is too broad a term. What level are you looking for?
As the above states, Baylor publishes a merit list that gives good $$ (20K or so) for high ACT/SAT with a relatively low GPA number. Really though, it depends on what “low” GPA is. And it will also depend on what school it is from and how rigorous your course load was. Anything over a 3.7, coupled with decent rigor and very high SAT/ACT scores will get you into at least one “top 25” school assuming there is no other hole in your resume and you write very good essays (and particularly if you have a mitigating story, like lots of high-level sports or need to work to aid family etc. etc.)
If you mean 3.5-3.7 it becomes a bit more scattershot, in my experience. And 3.0 - 3.5 (UW) takes some pretty specific targeting of schools where your standardized test score will be way over the 75% but your GPA will be near the bottom.
There are various threads around here that can give you some idea. The one for students with 3.0-3.4 GPA from 2017 has a long list that a poster compiled of the stats of each of those kids, including SAT/ACT and their acceptance.
If you have any interests in international study, McGill, assuming you have a “B+” GPA, (3.33 + for Arts college, Science and Engineering and other specialties can be higher) is particularly interested in test scores. The Brit U’s as well, esp if you have managed mostly 4’s and 5’s in your APs.
There is also a thread going right now for this subject for 2018 students where students have been posting stats and acceptances.
Hope this helps.