There will always be:
1. Personnel question - Poor Performance / Drug alcohol / DV type question
2. Critical Incident - OIS / Collision involving officer / Major incident requiring multiple jurisdictions.
3. What have you done to prepare for the position of Sergeant? You need to have this question memorized or planned out very well, and keep it around 10 minutes. Education/Training/Experience. All of it must tie into the job description/KSA of Sergeant. They dont care what you have done as an officer, they want to know what you have done as an acting sergeant, peer support, leader.
4. Have a closing ready. Your reason for becoming a Supervisor, your leadership values, Etc.
Know your policies and procedures. While you need those for the written test, you will also need them for the above. I did flow charts for critical incidents, since they are similar in how they need to be approached.
Sergeant is the best move I could have made. I love it.