i see this questions quite a bit. i think it is not so important to see a score conversion, but for the person taking the practice test to see why they missed what they missed, and understand why they missed it.
if you have the general mind set that, "i don't want to miss more than 3-5 per section" then you'll be set for taking the real test. that is what i did. (oh, missing 3-5 is typically a 20+ for any section on a practice test and generally on the real test as well)
just know the material and don't get too bogged down with abitrary scores from practice tests as none of them really have exact conversions. they are not exactly like the real thing ya know.
you pickin up what i'm layin down?? (<-- haha, had to throw that out there)😀