Math placement test score converter

Does anyone know how they convert the placement test scores for math? I took their practice test and I wanted to know where I might be placed. They said they convert scores to 150-850 but how does this work? Thanks!

No idea about the practice test but this is how the actual test scores are applied to various courses https://www.math.wisc.edu/math-placement-tech-algorithm-uw-madison

I meant converting a raw percentage score to a score out of 850, not what a score out of 850 means.

Sorry, not sure how that works then!