100% on the Practice Quiz on SDC

[Merlin]

They say you can only get like 30% but I've gotten more than that every time I've done a practice test (which admittedly they've only had one for I think three of the classes I took). Most recently I did the Computer Concepts and Applications placement test and got 50% (43% the first time, 7% more when I re-did the placement test)

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I concur. I've also gotten more than 30% from placement tests... particularly if you take the additional ones.

So my question still remains if someone gets a perfect score on the placement test how much of the course does that test you out of?

No way to know. I'm sure each course is different too, just like not every course even has a placement test available.