A great post by the Tuck School at Dartmouth, where I was an exchange student: http://www.tuck.dartmouth.edu/mba/blog/so-you-want-to-work-with-an-admissions-consultant
As someone who does admissions consulting myself I especially liked this:-
"A dead giveaway is when you accidentally submit a draft copy of your essays with the consultant’s notes all over them. Rare, I grant you, but it’s happened. More commonly, something in your application raises doubts in our minds. We notice that, although your Analytical Writing Assessment, TOEFL or IELTS score is low, your essays are perfect. You seem to know the questions we’ll ask in the interview before we ask them. Now, you could have done this all on your own, but it gives us pause. In a competitive applicant pool, don’t give the Admissions Committee a reason to weed you out.
"
As someone who does admissions consulting myself I especially liked this:-
"A dead giveaway is when you accidentally submit a draft copy of your essays with the consultant’s notes all over them. Rare, I grant you, but it’s happened. More commonly, something in your application raises doubts in our minds. We notice that, although your Analytical Writing Assessment, TOEFL or IELTS score is low, your essays are perfect. You seem to know the questions we’ll ask in the interview before we ask them. Now, you could have done this all on your own, but it gives us pause. In a competitive applicant pool, don’t give the Admissions Committee a reason to weed you out.
"
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