Many people are told to brush up on current affairs before attending a job interview by learning key facts.
What this fails to recognise is that people who KNOW anything on a subject, do not talk in facts. They've already digested the facts and have formed opinions.
So my best advice for anyone wanting to appear more knowledgeable ahead of a job interview is to read or listen to a range of opinionated commentaries on current affairs and economic issues.
Even if you don't adopt a particular opinion yourself, you will certainly be better able to come up with satisfactory answers if you adopt this approach.