Do I need to explain why I'm applying test optional in the additional information section of my application.
It is not generally required but if you feel that explaining will paint a more full picture of you as a person and student then it might be helpful.
It depends on your reason for applying test optional in the first place. For reasons such as lack of funds, mental health or just health in general, the covid situation in your area or even a family situation eg. loss of a parent or relative, including this information will give them a clear view and will help them understand your reason better.
But if you're applying test optional for other reasons like you just don't want to do any of the tests or you're not good at standardised tests it would be better not to include this information because it gives the impression that you're to willing to push yourself.
Keep in mind, if you're applying test optional your grades, course work and GPA have to be pretty impressive because they have no other way of evaluating your academic performance or your responsiveness to tests.
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