I do not recall a most difficult or unexpected question. As long as you review a bunch of behavioral based questions then you should be fine. You should have at least 10 different situations for 10 different questions. You will most likely be able to use the same situation twice for two or more different questions.
Group Leader Interview Questions
735 group leader interview questions shared by candidates
What are your long term career goals? Though this is a straightforward questions, at 24 years old it's hard to conjure up what you want to achieve over the course of your career. I referred to my longing for management experiences, leadership opportunities, and the opportunity to work for a highly respected company.
What would your peers say is your greatest opportunity and would you agree or disagree?
Tell me about a time when you challenged someone to do a better job. Describe a person you have had the most difficulty motivating. Tell me about a time when you failed to deliver on a work commitment. Provide an example when you helped someone improve their work performance.
What you would have changed about your most difficult task and how you executed it
are you prepared to work shifts form 6am-6pm or 6pm-6am?
Tell me about a time you did not complete a task or project on time
Scenario based on job situations and how would I handle it.
System architecture design session with real-life challenges
Experience of working with children
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