I'll help you case for free! :)

Take this with grain of salt, as I am recruiting right now and have upcoming MBB interviews but have not done them yet. I would say for me what helped to get general business knowledge is to read/skim through industry reports that MBB puts out. They have industry repots for every industry (consumer retail, technology, etc) and reading through these trends was beneficial for me to learn how they conduct their analysis, learn business jargon, and to get general industry knowledge

Hey there! Thanks for reaching out. The first response here is great ^ ; definitely go over the industry reports that MBB publicizes. I did this for at least thirty minutes a day for two weeks leading up to my interviews. I wouldn't rely too much on the practice cases to build your business intuition, as you're limiting yourself from all of the great resources out there. I recommend you sign up for daily newsletters (I personally really enjoy Morning Brew, Wall Street Journal The Markets, and Financial Times Unhedged). I also utilized Podcasts (McK has a great channel with relevant content) since they're very convenient and easily accessible. There are also great Youtube channels that post interesting topics that could help you in cases (I very much appreciate Modern MBA's content). The most important part of building business sense is to make sure you understand what you're intaking. If you come across a specific terminology or argument on any of these sources, regardless of how much you understand it, take a few minutes to Google it further and build that intuition organically. Genuine interest is what will solidify your business sense. There is no shortcut to this. 

If you don't have time for any of this and just need the quickest, most effortless option, I recommend you read the Wall Street Journal every morning. Don't focus so much on "hitting the mark" and trying to learn everything in a short period of time. Again, try to find genuine interest in what you're learning, and I promise you will have better business intuition before you realize it. 

Best of luck :) 

One thing I would caveat to the above is if you have limited time don’t spend like 3 hours a day reading reports and news and only an hour doing case prep or behavioral interview prep.