For the large fraction of the study population learning gain increased as a function of the IELTS score. Considering that 5.5 -8.0 IELTS score range covers a broad range of TOEFL values , it is understandable that the dependence of the Hake gain on IELTS is not smooth. For a small subset of population above IELTS = 7.0, the pretest scores are high enough that large gains are not likely.