I believe you got to the wrong toilet. They werre through at the entrance washing area, but efinitely not the toilet inside. Pls revisit and have a better investigation, if you have a chance.
The next thing is Pui Kiu and WKF are 2 totally different school in teaching method or many perspective.
To consider a school for your child, it not weight by the "shcool fees", but the teaching methods and mission of the school if it fit in your thought.