I experienced the same thing. I must admit that at least for me the score doesn't count a lot on the older tests I have taken. If you do have some fresh tests, maybe use those to simulate test situation and use older tests for practice.
@johnmelcon Ah, yes, I had the history and gender one -- modern times vs roman times? (not to be confused with African American women's suffrage -- which I also don't know the status of)
Just for the record you are not supposed to take it on quizzes and all. It has to be done with a professional (my cousin is one so I know) even I have just done it online. But it's not supposed to be accurate that way.