How does the BCG Casey Chatbot work, and what is the best free way to prepare for it?

Hi everyone,

I’m trying to better understand how the BCG Casey Chatbot works in practice and, most importantly, how to prepare for it effectively.

I would really appreciate insight on questions such as:

• What is the structure of the Casey Chatbot?
• Which skills does it test the most (e.g. math, data interpretation, business judgment, creativity, written communication, time management)?
• What are the main differences vs. a traditional case interview?
• What are the most common mistakes candidates make?

I would also love to know the best free preparation resources.

At the moment, the only platform I have access to is CaseCoach (through my university for 6 months), so I would be especially grateful if someone could suggest a structured free study plan using free resources only.

For example, something like:

• for mental math → best free resource
• for charts/data interpretation → best free resource
• for business judgment / case thinking → best free resource
• for written communication / synthesis → best free resource
• for full Casey-style practice → best free resource

If you have already taken it, it would be super helpful if you could share:

1. what surprised you most,
2. what you wish you had practiced more,
3. and how you would prepare if you had to start again with mostly free resources.

Thanks a lot!