How much can I realistically improve?
It depends on what went wrong. A pacing problem can move a section score quickly, because the knowledge is already there. A genuine content gap in a broad area takes longer. Reading the report is how you find out which you are dealing with.
This comes up on TEAS Retake Support, 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.