Private tutoring is not a new phenomenon for education in both developed and developing countries. However, English private tutoring (EPT) attracted a limited number of studies, although English is viewed as the key to success in non-English speaking countries like Cambodia. By observing EPT as a choice, this mixed-method study, using the convergent design, aimed to explore factors affecting Cambodian 12th graders towards quitting or not quitting EPT during the year of the national examination. Quantitative data were collected from 639 twelfth graders in Cambodia via a self-rated questionnaire, while qualitative data were obtained from 8 respondents. Findings reveal that the decision of leaving EPT is more influenced by their parents, while that of continuing EPT is stirred by educational aspirations, internal motivation as well as part-time employment during their university life. Surprisingly, unlike private tutoring of other core exam subjects, this study found that students from better income families in Cambodia do not seem interested in investing in EPT. It is proposed that an 'exam-career balance' syllabus be developed and implemented in both mainstream schools and EPT classes to boost the success probability of Cambodian 12th graders in their exams as well as their future.