We use My Pal (but I forget pressed by Longman or other)
Besides, they have joined the PLPP program organised by EDU. Every week have 1-2 double lesson teached by native teacher about story book.
GS will use Chinese but they said this year will try one to two topic teached by English
In general, I feel the level is lower than the private school but I don't know other gov't school. After your research, pls also let me know the other govt school use what text book.