Have some 4-5 stories handy and flexible. A singular story can be composed in many ways.
Here's one mine:
A group project. I lead. Teammates quarrel. Deadline at neck. Find the source of fight. Resolve fight. Teammates happy. Work done before deadline. Boss happy.
These are only some pointers. Frame a story around this. Now this story can be used to answer these many kindsoff questions:
- Time when you resolved a fight
- Things you did when you had a tight deadline
- Something you did by going beyond your work
- Issues you faced with a project
etc
This is just my way of doing behavioral rounds. Let me know if theres any