They're actually the newest and they were scaled against students who took them. Imagine what happens when you scale a tests against people who took 9 other tests, the AAMC practice exams, and were now down to these.
I've seen reports of students who scored mid-high 30s that ended up with a 28 on 10 and 11, which makes sense if you think about it (a bunch of high scorers were normalized to have an average of 24).
Take the tests and learn from the content by reviewing them (very tough content) carefully. Other than that don't worry about the actual score.
Hope the inside baseball helps describe how the scaling is done.
