I ran the Beatles quiz by my father (our first conversation in weeks) just to make sure there were no WTF moments like that fucked Nirvana question that I can't think of any explanation for.
... and my dad, biggest Beatle fan I know, got an 80%. He was particularly irked by the question about who tailored the suits for the Abbey Road cover. Admittedly, I only go that one right because I knew it wasn't Tom Ford, and Tommy Cooper was a freaking comedian:
Having spent so much of my working life dealing with stats and the validity of various tests and measurements, I can say with pretty good authority that these quizzes don't offer a valid representation of one's knowledge of the subject matter.
So dont fret if you did poorly.
I think the Ramones quiz is the only other one that I might do well on. I don't even need to bother with the Pink Floyd test, or anything like that, because I know I don't have a chance.