The King Williams College annual quiz is perhaps the daddy of all such end-of-year brain-wreckers. The 2007 edition is here.
Good luck!
UPDATE: After a first (and Google-free!) run through the questions I am reasonably confident about the answers to about 25 of the 180 questions and have an idea about a couple of dozen of the others. As I say, it’s not for the faint of heart.

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