There are many ways to measure language proficiency, one of which is by using English Proficiency Index (EPI). It is a product of EF Education First, a global language training company, and draws its conclusions from data collected via online English tests available for free over the internet[2].
Among the countries in Asia, the study shows:
Rank Country Score Level
9 n Malaysia 55.54 High Proficiency
12 n Hong Kong 54.44 Moderate Proficiency
13 n South Korea 54.19 Moderate Proficiency
14 n Japan 54.17 Moderate Proficiency
25 n Taiwan 48.93 Low Proficiency
26 n Saudi Arabia 48.05 Low Proficiency
29 n China 47.62 Low Proficiency
30 n India 47.35 Low Proficiency
32 n Russia 45.79 Low Proficiency
34 n Indonesia 44.78 Very Low Proficiency
39 n Vietnam 44.32 Very Low Proficiency
42 n Thailand 39.41 Very Low Proficiency
44 n Kazakhstan 31.74 Very Low Proficiency?