Так, вопрос интересный, т.к. работать во время учебы на курсах английского можно, если вы учитесь "in a full-time study course lasting at least six months, at a private training establishment or tertiary institution. Your visa or immigration officer has to be satisfied that the main purpose of your course of study is to develop English language skills, and, you have an International English Language Testing System (IELTS) overall band score of 5.0 or above (General or Academic Module)".