I guess wawawa is talking about a recent topic on YW Primary School in "hk-farm" website. I don't think it's "terrible" at all. The aggrieved parent should voice out his/her comments to the school management directly with a view for improvement. It's pointless/destructive to state the case in a public forum! I've just enquired my boys(P1 & P3) and they said they have NOT encountered similar cases!
If it is the case in HK-farm, I don't think it is a big issue. Sometimes, you have to prove for our kid's information. Maybe there is something missing by their mouth.
However, if teachers always take sick leave. It should be concerned.