Upon graduation, he taught Cambridge International Examination (CIE) Physics and Mathematics at both the IGCSE and A-Level in an international school setting. Here, he successfully guided students of diverse nationalities to academic excellence and became a highly regarded mentor within the student body. He was heavily involved in curriculum development, creating highly effective, scaffolded learning materials tailored to bridge knowledge gaps and boost student performance. Furthermore, he oversaw the comprehensive execution of physics laboratory sessions across both the IGCSE and A-Level syllabi, ensuring students developed strong practical skills.

Today, Mr. Leong possesses an in-depth understanding of the Cambridge syllabus and the common pitfalls students face during examinations. His subject mastery, ability to communicate highly technical concepts clearly, and dedication to cultivating an engaging classroom experience consistently help his students build newfound confidence in Physics and achieve rapid, significant grade improvements. He is a firm believer in empowering students to excel through a proven cycle of consistent review, targeted practice, and constructive feedback to achieve true subject mastery.