I have taken (and passed) the exams for D01 through D03). From seeing the preferences of the judges, here are some suggestions for aspiring exam takers to get a positive revue.
!. Most important, make sure your guitar is carefully tuned.
2. Try to avoid background noise such as fans and conversation.
3. For videos, it's always best to dress well and present yourself well.
Once you have qualified through the lessons to take the exam, I suggest you concentrate on the exam piece. Record yourself and listen to your recording a day later with fresh perspective. Work on anything that didn't sound quite right. It's best to clean up any tendency to buzz from touching adjacent strings. Listen repeatedly to Prof. Delcamps' recording so that you are thoroughly familiar with the melody. Try to match his pace but it's better to play at a pace that allows you to play cleanly. Just not too slow. If you simply can't get up to speed, it might be best not to test this year but rather give yourself more time. When it comes to learning classical guitar, there is no quick and easy route.
Best of success to everyone who has stuck to the course and invested your time and effort to reach this point.