I got 80% on Part 1, 92% on Part 2, and 95% on Part 3. Donovan Albanesi offers these as his best effort and is open to criticism. He is a working professional in education, free market, not public school. He does fix glitches in the citations and quotations. (re: Laure on that.) He is also a second-generation Objectivist. So, he can err - as can we all - but he pretty much grew up with the canon.
I agree that this kind of learning and testing is useful. Rand was very concerned with proper word usage. As noted above, many of her admirers are self-taught: they bring her ideas into their personal, experiential worlds. These tests assume that you entered Rand's.