They are not only primary student, I also saw some teenager studying there. (I don't know where were they from, they changed their uniform).
About the discipline, I am not sure, cos I only saw them when ppl open the door..... If you want to know, you can stay there for a short time and watch.
My daughter studied at Lai Shing Educational Centre at Phrase 2 from Mon. to Friday for doing assignment and revision. She enjoyed the time as teacher was good. After returning home, all the homeworks were finished.