I am sorry but I have no idea. As I observe that my son's mathematics was not good when he was in K2, I was recommended by a friend to join The EQuilibrium (Tin Ping) Mental Mathematics Course. They provide free trial class for child and parent. You may call them to find out. Their tel nos. are:
Kowloon Tong 2868-2462
Central 2526-6228
Tai Koo 2513-1115