Below is my vision on how to approach case preparation. I would be more than happy to help you tackling all these aspects and developing both your confidence and efficiency during interviews.
Starting your case practice journey from the right foot
Your case-cracking sessions may feel awkward and unnatural if you don't focus on the actual purpose of this exercise. If the 1-hour case study is so commonly used across consulting firms (and even beyond) to assess the potential of candidates, it is because it allows to easily differentiate between the candidates who rely on pre-made recipes and the ones who actually put their brains at work.
I am not here to give you any magic secret which will open the doors to all consulting firms: it wouldn't be such a competitive industry if it ever existed. I am willing to give you a set of tools which will allow you to be independent and agile when the time comes for your interviews.
Practice makes perfect
The beauty (and difficulty) of case cracking is its infinite extensibility: a single case study can be approached from as many ways as there are candidates. In order to feel confident, it is necessary to multiply the variety of case studies and tackle different types of business issues.
Preparing myself for case interviews, interviewing with top consulting firms and working in BCG helped me build a strong overview of different topics and industries. The goal for your preparation is not to become an expert on all industries but to help you develop creative thinking in order to bring in new ideas during your case study on any topic.
Personal fit: being good for the job
Many candidates only put their effort into preparing for case studies but the reality is that overlooking the personal fit can give your interviewer the impression that you are only here to ace the interview process without thinking through how good you would be for the actual job.
Coming from both engineering and business study backgrounds, I can help you highlight the right skillset which stays true to yourself while providing compelling arguments for your fit with consulting.