Earlier quoted context omitted.
There is no practice that simulates anxiety. Anxiety is mostly incompatible with the mental effort one usually applies in coding. As you have put it, the white board is convenient for the interviewer, but that is missing the point of the interview which is to assess the candidate. If you do not find if that difficult, than consider yourself privileged because most people feel differently. Some people cannot speak to…
>There is no practice that simulates anxiety. Ah, but there is. Once you go through few interviews you get less anxious about the next one. Which means, that if this is a serious problem for you, and you expect some important interview in the future, then you have to go and interview with some other companies before to gain practice, and may be even get some job offer you'll like more than the one you are hoping for.…
That's not really practice, it's actual experience.
It's also not guaranteed to improve your skills, it might make it worse if you have a bad experience. When that happens it's easy to make generalisations about the next ones. That's actually somewhat descriptive of where anxiety really comes from, antecipating the unknown.