this is a really simple question, but I just want to make sure that I'm on the right track.
Should I write about my ACT and SAT subject tests cancellation due to COVID-19 on the additional information section? I know that most schools take the test-optional policy, but I want college admission deans to know that I "could not" take the tests, not I "chose to not" take the test.
Yes, definitely! It can't hurt, and it's good to make sure your intentions are clear to the college you're applying to; HOWEVER, because schools are test optional this year, not having subject tests will not hurt your chances and can only help them, so if you don't have room in your additional information section don't worry about it! Schools will hear about many situations similar to yours during this year so it is fully understandable.
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