This research was conducted to determine the mental skill among school athletes. This research was conducted using survey method among 24 ten-pin bowlers that represented Perak in the Majlis Sukan Sekolah Malaysia (MSSM) 2018 tournament. Sport pErsonality Questionnaire (SPQ20) questionnaire was used to measure the 20 mental skill dimensions that consisted of 4 main domains that are achievement and competitiveness, confidence and resilience, interaction and sportsmanship, and power and aggression. SPQ20 also determine the athletes’ trend on the mental skill matric and leadership potential. Descriptive analysis is based on the Red, Amber, Green (RAG) Traffic Light system approach. Results showed all the mental skill domains were at the yellow level (intermediate). Based on the mental skill metric, highest number of athletes were in the confident achiever group (54.2%). Based on the leadership potential matric, highest number of athletes were in the democratic captain group (33.3%). The research demonstrate the importance of evaluating the athletes’ mental skill level, methods on using suitable measuring tools to gain information on the mental skill level, and the way to report results of study in order to enhance coaching aspect.