Know I wasn’t tagged but would really reiterate some of the sources Jacob said - immensely recommend Finimize, the daily FT podcast is great whilst having a coffee in the morning, also I went through Investopedia’s dictionary terms to make sure I understood any business terms that could have came up, and listened to podcasts like Americast and Reasons to be Cheerful. They were all I used to participate in the AS commercial awareness competition and for TC apps and ACs.
definitely agree about picking out a few commercial areas for a bit of a deep dive - the ones I did were AI in law and tech risk, and climate change, and tried to look at how these things could affect individual clients (and tried to find clients the firm worked with to specifically mention), and cause new trends in business, also looking at what law firms could pre-emptively advise on to help clients stay ahead.
hope this even vaguely helps!!

good luck I’m sure you’ll do grand!