PSE Primary School Exercise App, a user-friendly mobile application, aims to provide online exercises to primary school students. It is supported by various electronic devices such as mobile phones and tablets. Owing to its convenient design, students are likely to finish the exercises anywhere. Students utilize their time to do PSE exercises daily is not meaningless. Not only develop their study habit, but also increase their interest towards self-study. Doing exercises is one of the essential elements to revise knowledge effectively and efficiently. The exercises mainly focus on strengthening students' basis as well as enriching their knowledge through different topics. Having a good basis is a stepping stone to gain further information. Hence, students will be attracted to learn actively. Both simple and difficult questions are included in the exercises to fulfill different students' demand. Various topics are well planned according to the teaching schedule of school. Students can choose their favorite characters in the game.