This is a stressful question! By staying calm when you answer it you are already showing you can handle the pressure
The best way to help you stay calm is to have an example prepared. STAR is:
Situation
Briefly describe the situation, e.g. my project group were due to give a presentation at school, but one person had to drop out due to illness.
Task
Explain what needed to happen, e.g. we had to find a way of delivering the presentation on time with the remaining team.
Action
Explain what you did, e.g. I read over my friends notes and managed to incorporate the key elements of their part into my section of the presentation.
Result
What was the outcome, e.g. the presentation went ahead on time and we received really positive feedback on our ability to re-write it at short notice.
- Be honest but stay positive
It's ok to say you find pressure stressful but saying you don't get stressed may create the wrong impression.
- Don't focus too much on the stress
What caused the stress isn't important, it's how you handled it that counts.