Boston Consulting Group Data Science interview questions

I applied online for a Data Scientist position with BCG GAMMA. Initial phone interview with Recruiter, followed by 3 rounds of interview. 1st round - I was given data for a homework case a week in advance, and had to present the findings to a Principal. 2nd round - 2 interviews. One with a Project Leader, and other with a Principal. 3rd round - 2 interviews. One with a Principal, and other with a Senior Partner. All interviews were for 45 minutes. Around 10 minutes of behavioural questions, 25 minutes for a case, rest to ask questions. The whole process took 4 months.

The interviewer asked a lot of technical questions for the data science project, which is clearly well designed to include many possible issues in real data set. Need a lot of hands on experience to perform well.