With regards to finding/utilizing resources in the context of preparing for a case interview - think of it as a marathon and not a sprint. What that means is that you have to adequately pace yourself and prepare in stages to achieve the best results. Here are a few things to note

Start with the fundamentals

• Many people want to start with full cases from day 1 and think that they will get better if they constantly practice a case end to end. This is an approach based on the thinking that if I know the answers to a question then I can build the theory behind it. It can work in multple choice questions to an extent, but overall you need to approach casing as building a new set of tools and skills. It is a whole new approach to solving a problem so make sure you approach it as such

So what should your approach be?

• Start with case books and other preparatory material that introduces you to the theory behind casing and helps you build the knowledge blocks you need. Many people will tell you that these books are useless and you should never use these frameworks in an actual interview. While it is true you can't copy and paste frameworks, the books are very helpful in building your understanding of what a case consists of and how you should approach casing
• Also try and gain an understanding of the various industries you may come across during a case interview. While you do not need to know anything about an industry to solve the case, it does help tremendously in building confidence and helping you navigate the case especially if you tend to get lost easily.

Work on each individual skillset 

• Casing has a few core elements - structuring, creativity, analytical skills and quant. Work on each of these individually. There are many resources (rocketblocks, case books, case in point) that will help you build these up. Don't ignore the effort it requires to be good at each of these individually

Work your way up

• As you get better with your skillset - do not rush to solve case prompts on the McKinsey or BCG website. Why? Because these are the closest to an actual case that you will get so save it till the end (just like you did for SAT or GMAT prep).
• Instead - start with cases in case books, online resources etc.
• Save the ones that most resemble what you get in an interview for when you are more confident in your abilities

Practice the right way

• Regardless of where you source your cases, it is very important to practice with other people. Casing is not a solo activity, the purpose of casing is to perform well in an interview setting. If you practice by yourself, you may develop a false sense of confidence in your abilities which will not translate in practice. This is because casing tests for your ability to listen to a problem vs reading a problem and to also taken hints and cues from the body language of the interviewer as these are all important skills you will need as a consultant.

Best,

Udayan

(editiert)