 Chamlong went to Ban Somdej Chao Phraya High School in Thonburi, where he was a top student.He then entered the Armed Forces Academies Preparatory School, Thailand and was accepted into Chulachomklao Royal Military Academy, where he graduated in Class 7.He developed a close relationship with his classmates Pallop Pinmanee and Manoonkrit Roopkachorn, both of whom would play important roles in Thai politics for decades.