Although the flipped class has been hotly discussed, the clicker-aided flipped EFL class (CFEC) still remains a mystery for most scholars. This study aims to determine the correlations between the initial EFL proficiency and other variables of the clicker-aided EFL flipped class. The sample was made up of randomly selected 79 participants (Female = 38; male = 41), who received the clicker-aided EFL flipped class for one academic semester. It is found that there is a significantly positive relationship between the initial and the final EFL proficiency, motivation levels and cultural awareness in CFEC, whereas there is a negative relationship between initial EFL proficiency and cognitive loads in CFEC. The initial EFL proficiency is therefore an essential factor to influence the effectiveness of the flipped class. Future studies may consider this when exploring the educational technology aided flipped class.