<p>Of the 29 universities that actually require subject tests (and not just recommend them; see first column of the list here [Compass:</a> Admissions Requirements](<a href=“SAT Subject Test Requirements and Recommendations - Compass Education Group”>SAT Subject Test Requirements and Recommendations - Compass Education Group)), Caltech, MIT, Webb Institute and Franklin Olin are the only ones that require both a math and a science of all applicants. You mention Harvey Mudd which requires math level 2 but second one is applicant’s choice.</p>
<p>Others among the 29 require both a math and science for some majors such as engineering or science or even architecture: Carnegie Mellon (includes architecture); Columbia; Cornell; McGill (includes architecture). Duke requires a math for engineering and recommends a science for the same. Princeton and Penn state a preference but not an absolute requirement for a math and science for engineering.</p>
<p>There are also a number of schools such as Stanford and some of the UCs that recommend but do not require subject tests and recommend a math and science for engineering.</p>