Gamification in Asian Classrooms
While not exactly an answer to your question ...

I should start by saying I am not an expert in the field of education or learning sciences, but it appears your gamificiation strategy is based upon extrinsic motivators. In my opinion, Malone and Lepper (1987) make a pretty clear case that intrinsic motivators are the way to go. Therefore, asking a question about how to optimize extrinsic motivators seems like a premature optimization problem. The framework that Malone and Lepper (1987) set out with individual motivators (challenge, curiosity, control and fantasy) and interpersonal motivators (competition, cooperation, and recognition) seems like it should be universal, although how to achieve those motivators, and the relative strengths of them, will likely vary with culture.