Well, you can cram for it, but as a general matter other than brushing up on a few of your weak spots (state capitals, Olympic cities, U.N. Secretaries-General, whatever), I don't see it being very useful for too many. Basically, you either know it or you don't.
On that premise, The Challengers requires you to be knowledgeable in current events, although there were many questions that were merely current-events-adjacent. However, it did behoove contestants to at least be scanning the pages of Newsweek and studying up before their tape date.