[Question] Raw Score Converter

Hello! Quick question - is there anywhere we can find the raw score converter that the system uses to generate our practice test scores? I'm trying to determine the bracket of how many questions I am able to miss to increase my score to certain levels. I know this changes a little each year based on the test, but I was wondering if there was a standard one that Khan is using each time.

As always, thanks so much for all of your help!