This document summarizes the achievements and lessons learned from an internal study group aimed at increasing the skills, knowledge, and certification passing rate of project managers in Indonesia. Over the course of 18 seasons, the study group had over 600 participants and a pool of over 300 mentors. Key achievements included helping participants pass their Project Management Professional certification, providing networking opportunities, and increasing membership in the local Project Management Institute chapter. Lessons learned centered around issues like lack of commitment from mentees, ensuring active participation from both mentors and mentees, and maintaining mentor motivation over time. Changes were implemented such as requiring eligibility IDs, dedicating individual mentors, using collaboration tools, organizing appreciation programs, and engaging mentors through gatherings and outbound