You want to be able to take it one question at a time. Without a worry about the next question or the previous one.
You want the approach that gives you the best result. Everyone has their own style they default to under stress. Instead of worrying how to behave and add another layer of complexity, I would recommend taking what you have and building on top of that. If you naturally panic, then introduce counter measures to that. If you are missing answers and fall into traps then build in countermeasures for that.
I am pretty sure people have succeeded with a multitude of mindsets and attitudes. We are who we are. Know thyself 😎
Posted from my mobile device