I went to the school on Tuesday and I also forgot to bring the original birth certificate. The staff collected my form asked me to bring the original to the school on or before the application period. I felt she was helpful and polite.
Everyone has different feeling and perception, but a lady who doesn't have consistent behaviour is not trustworthy. She seems to be efficient, but rather rude, and without patient.
I regret that I have hand in the application, and feel bad if my son is under her influence.