This paper embarks on a journey to unfold the code-switching phenomenon of Malaysian undergraduate students studying in Sydney. In the South East Asia region, Malaysia being a multiracial and multicultural society, code-switching is an important characteristic of the overall dynamic picture of linguistic interaction amongst Malaysians. It is common for Malaysians to code-switch in a single situation since most Malaysians are at least bilinguals. This study deploys 12 interview questions using 6 levels of Vloom;s Taxonomy questions to contest students's linguistic efficacy. It was hypothesized that students would resort to code-switching more in answering difficult and challenging questions, but this was not the case in this study whereby 3 students were persistent to using English as much as they could. From that revelation, the researcher conducted another round of data collection with the same four participants in order to try to explain this unexpected scenario. This research also denotes the underpinning factors on student's persistence and motivation to use English rather than to code-switch in answering difficult questions.