How to convert in person practice test percent score at prometric site to 3 digit score?

[wrkndply]

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I just took a practice step 1 exam at my prometric site and got a percentage score for the exam?

Is this as accurate/ predictive as the nbme practice exams? How do I correlate my percent correct to a three digit score?

Thanks!! Taking it in a week so hoping to see where I stand.