Group interview: how would you plan to invest $1M for her/him. Actually the interviewer is testing your knowledge about current news. So you need to come up with investment ideas supported by recent news. (your investment ideas DO NOT matter) I think the interviewer is trying to screen off those who are not genuinely interested in finance.
Then they give a job shadowing for about 15 mins. Don't be misled by the job title "analytics", it means telling Bloomberg users about how to use its terminal. It's like a chat room on the terminal, so you answer whatever questions that come. And sometimes you need to pick up phones calls.