For an average student, admitted student I mean, each school offers more than enough in stem. If you are into the IMO type of competitions, you can take a look at the results publicly available. If a school has more kids scoring high, it usually means the school has that kind of environment and support and the kids. For researches, you can also check out results of those competitions. However, many times the researches are done with resources outside of the school, so it may tell less about the school.
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