I would very much recommend subscribing at least one of the following news papers, even if its only during the prep period before your interview:
New York Times
A good way to improve your business judgement is to read the headline first (if its a business headline) and then ask yourself why X has happened, before reading the article.
E.g. WSJ article says ''BMW reports a loss in profit over Q3 2019'', you can create a mental framework (or on paper) to think about the potential reasons for why this happened.
Hope this helps!