how to prepare for case study for management consulting?

In case interviews, this is the general resources list that is widely used: 

• CraftingCases (free) - has articles + free 7 day crash course - personal favourite of mine since it dives into case components, has self-study drills and walkthrough examples
• PrepLounge (free) - has a market for matching individuals case prepping with one another - it's a hit or miss where you sometimes find some incredible people globally and many students casing for the first time
• RocketBlocks (free trial) - offers 7 day free trial and has (in my opinion) the most helpful consulting drills to practice mental math, case structuring, data extrapolation and some other stuff 
• Victor Cheng's Looking Over My Shoulder (paid) - a paid case interview walkthrough where you hear an interviewee deliver a case and the narrator highlights why the execution was good, this is *invaluable* after you've done ~5-10 cases and become conscious of the case cues to hit 
• Case in Point (free) - offers a *foundational* understanding of the case interview process along with some basic/rudimentary frameworks - this gives you a bit of insight into the high-level areas to brainstorm around and some common questions, but keep in mind that frameworks need to be customized for the case
• Case Interview Secrets (free) - offers a more in-depth look into the consulting mindset and how to structure frameworks from scratch - I'd argue this is more applicable to on-the-job thinking, but I've seen it work really well (and I've referenced it myself)  
• University Case Books (free) offers more cases than anyone could possibly cover in a lifetime; you can find them by simply googling a university + Case Book and a year. "Darden 2013 Case Book" for instance.

Feel free to shoot me a PM - I can share some other resources.