I am simply asking your comments on Yew Chung's results. If CKY is a discounted version of Yew Chung, we can then estimate the results of CKY based on Yew Chung's.
All the Chinese teachers (except Yr.1) have to use PTH to teach in Yew Chung. Even the Chinese co-principal uses Mandarin in most of the occassions. The language environment in both schools has the same setting.