Usually it is driven by some qualifications. For example, the Ross one
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https://michiganross.umich.edu/graduate ... er-requestIt is pretty clear as to what they are asking or looking for - you basically want to say that it is not a good use of your time/challenge for you to get a test score and that you would be proving something that you already have (strong GPA/background in quant/expired test). Think of someone who took the GMAT 6 years ago and got a good score but it has since expired. You are basically wanting to project and say that if I were to take the GMAT/GRE, my score would be great but I am not able to take it for the following reasons or I am not inclined to take it because your quant/verbal skills are solid and you can prove it with your professional accomplishments.