[Bheliar]

People mean everything and nothing when they say they want a Data Scientist. So you inevitably will have many interviews that don't work out because you are not what they had in mind. Same goes for those questions. They don't have a clue so they don't know what to ask.

Make sure you know what you want. And of course what you can and can't do. And tell them right away. Cut your losses before a long interview process.

Find ways to talk about yourself instead of simply answering questions. Smaller companies have less rigid interview processes(but also less knowledge about what they want) where you can talk about your knowledge and interests.

On the other hand, if you want to get a job with a longer hiring process, you do need to prepare for those.

Get to know people from the field. Go to meetups ect. That gives you the chance to present yourself, too.

Evaluate what you are missing that could help you get the job you want. Decide which field, data ect you are interested in. Consider what skills you are lacking if you would do a complete project in that field. You are applying for an expensive positions, so people are wary about hiring you. They want you to sound like you got this.

I hope you find the right job soon!