Yeah, the percentiles were totally stuffed. I finished with 94.5%, top 25% also.
I did AI at Melbourne Uni back in 2003ish. The course content online was on par / superior. However, the exams/tests may have been too easy for an online course. Regardless, I'd say that there were not enough questions to get a proper curve. If you included about three times as many questions, it would probably be a good number.
Cheers,
-T