Become familiar with colleges’ admission websites. If you are a rising senior, this year more than ever, it is important to read the college’s requirements yourself directly on the website.
“Yale will not consider SAT Subject Tests for the upcoming admissions cycle.”
Subject tests are “optional” for Columbia.
Amherst: “SAT Subject Tests will not be considered as part of the evaluation of any applicant’s academic record.”
Pomona does not mention subject tests. (Another Claremont Consortium school, Mudd, will not consider subject tests, a permanent change they made following Caltech’s announcement in February, not relevant to the virus situation.)
You can, and should, look up the requirements for the rest of your college list yourself.