Is this allowed by my institution?
Proofreading, feedback and coaching on your own work are permitted by most institutions, and many universities run comparable services themselves. Policies differ, so check yours, and note that rubric-based feedback and coaching are the two services where nothing we produce enters your document at all.
This comes up on Who We Are and How We Work, where it is answered in the context of the work itself.
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Send the draft, the rubric or the score report with it. You get a real answer and a price before you commit to anything.