I'll second what TrolleyDolly said and do a dry run. You'll be in shock, but once you know what you need to work on, it makes it easier.
Bear in mind that it is a video, so if you don't feel happy with it then re-film.
But don't get into a tailspin thinking it has to be 100% spot on. I have heard that if you make a mistake, you've got 16 counts to rectify it before they count it as an error
Oh and we've got one of the UK trainers and presenters at my gym (though they are not a Combat one) and you know what -- they muck up a bit here and there too (which of course makes the rest of us feel a lot better
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If you dread filming, just do it and send it in. If it is utter pants, well you'll have to refilm the lot anyway. But worse case you'll only have to refilm a track or two -- which is a whole lot easier than refilming the lot. Plus you'll get feedback on what to fix.
Interestingly enough, you may even be surprised and shocked by the encouraging and constructive feedback you'll get from the assessor. I know I was utterly gobsmacked by some of it and they offered some good pointers on things to work on which I have been trying to do.