The aim of this experimental study was to compare the results before and after an intervention that included ambidextrous training to accelerate the enrolment of adolescents in technical, vocational, and educational training (TVET). In particular, the effects of an ambidextrous learning-based training programme on increasing the intention to enter TVET were examined. The independent variables constructed in this study include self-efficacy and TVET knowledge, while the dependent variable is TVET intention. The sample consisted of 480 16-year-old students from government schools in four Malaysian regions selected by cluster sampling. The study used a randomised experimental design with a no-treatment control group. The intervention included training developed as part of Behavioural Insights. Methods of analysis included descriptive and bivariate analysis of mean differences and structural equation modelling to describe the predictive model. The results showed significant differences between the actual and the control groups in terms of post-test results across all factors, including TVET intention, TVET knowledge, and self-efficacy. The structural equation modelling test found that TVET knowledge emerged as the strongest predictor of TVET intention, surpassing self-efficacy. As knowledge about TVET is the most important factor influencing a person’s intention to choose TVET, these initiatives should provide clear and comprehensive explanations of the concepts of TVET, the different TVET clusters available, and the potential career opportunities within these sectors.