Anna C thank you for your message.
As a teacher you know roughly where each student falls (distinction, high merit, low merit, pass etc). I don't compare theses students with previous ones.
Based on the amount of work (2.5 years, 3 hours a week plus a lot of extra coaching) we did for this exam and yes, taking into consideration they are doing a vocational exam and not a grade, I believe they should have come out with higher marks.
I do think it is very important to be objective and reasonable as a teacher. As I mentioned in a previous comment above, I wasn't expecting four high distinctions but they got very low merits which I cannot justify after so much work and attention to detail (free work prep, performance, music, use of space etc.).
My original enquiry was if I should appeal or not however, reading other comments and based on other teachers' experience, I don't think it will lead anywhere.
All the best,