My class 1 DE are very noisy

I say my class noisy because my class have many "HURIGEN"
That is Liew Zhen Jia,Lo Chin Keat,Low Kok Liang,Marcus Ling Xing Hong,Soh Zhen Ning,Lee Chee Kin and many many..................
I always tell them to keep quite but they all like cannot hear I say what!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
All the subject teacher very angry them!!!!!!