This study analyses the effectiveness of the self-evaluation technique practised by the followers of the Higher National Diploma in English (HNDEn) program conducted by the Sri Lanka Institute of Advanced Technological Education (SLIATE), with the main objective of assessing the effectiveness of self-evaluation as a teacher evaluation technique. The effectiveness of the self-evaluation technique is measured by examining the student teachers' self-evaluation reflections and their subsequent performance. The study adopts a mixed research design in collecting and analyzing quantitative and qualitative data. Findings are analysed using statistical data analysis methods and thematic analysis. Multiple themes are disclosed from the analysis that pertain to the reflections on the problems faced by the student teachers during the course of teaching and how they try to overcome them through the practice of self-evaluation techniques. The effect of novel self-evaluation techniques such as self-monitoring, goal setting, peer/mentor feedback, and reflective journaling that can be utilized for the improvement of student teachers was also disclosed. The results of the study have pedagogical value, as they draw the attention of novice teachers who endeavour to improve through the experiences they gain in the early stages of their teaching careers.