Being mutually exclusive in preparation
No I don't mean in casing, I don't mean MECE.
There are, just, so many cases out there. I solved around 60 and read about the same number from case books, and also watched about 30 case interviews on youtube. So far I'd say I have very good grasp on case framework and can tackle cases at different complexity levels. But the more I read/watch, I see there is some angle that would get me to the solution very quickly. I make sure to learn that technique and apply it where necessary etc. But by this rate I may spend years just learning small techniques. It's hard to cover ALL types of techniques, and then what if I need something during an actual interview I didn't really learn? :/
Maybe just anxiety but I'd really appreciate your thoughts.
That's just the learning process. It's ongoing, and will be for a long time.
Case interview (and structured problem solving for business at large) is not a single skill that gets learned in 3 easy steps and then bye bye. You learn the basics, refine them, learn more, and then go back and forth between plateauing and honing your skillset (with the occasional new tidbit of info).
Just get to a point where you are comfortable solving most problems in the allotted time. The honing part you get to on the job. Remember, 80/20 isn't just about contents, but also about process.
I disagree. If they've gone through 90 cases and still don't get it then there's probably something wrong with the approach
It sounds like OP is trying to solve casing by forcing down as many frameworks and niche solutions as they can. It's much easier (and relevant for actual work) to get decent at the key basics like understanding a problem statement, coming up with decision trees and hypotheses to test them, and understanding how to create a formula from a word problem. You don't have to know a lot of specific things to do well in cases
FWIW, during interviews it can be obvious when somebody is trying to force fit a specific framework to a case where it isn't really required, and often it's a distraction more than anything
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