Background: Following initiation of the three-step national licensing (NL) examination, NL step 1 is the most difficult step of all. As our curriculum has been based on problem-based learning since its establishment, the block committee of each block system is responsible for planning the learning process to secure educational outcomes, student-learning promotion and a satisfactory rate of NL passing results.
Objective: The present study aims to identify key success factors that have been implemented each year to achieve successful NL passing results.
Material and Method: Three parts with nine new ideas were implemented each year. These parts included the three ideas of extra-materials preparation for effective tutorial sessions, three ideas of student-learning process motivation and three ideas of the reliable assessment preparation.
Results: Mean scores on block satisfaction were above 4 (from a total of 5) annually. NL passing-rate in each category during the last-two-year is above the country’s average score.
Conclusion: This review demonstrated a key factor which contributes to student success in the endocrinology block.

Keywords: Key success factors, National license passing results, Part 1, Endocrinology block