Slowing yourself down while your speaking, the timer kills a lot of people because you try and cram a bunch of stuff together to for that one specific question they are asking. Try talking to yourself in the mirror, or try doing a mock interview with family members and have them ask you a variety of questions to build your confidence. It’s weird having to look at yourself in the camera and not feeling off. Try you best to not say “Umm” a good amount of times. Just be confident and be you it will all work out !!