The progress and development of any country or society are intrinsically tied to the growth and well-being of its youth. Adolescence, defined by the World Health Organization (WHO) as the period between ages 10 and 19, is a crucial stage of life characterized by significant physical, mental, and emotional changes. This paper presents the findings for the process of developing and validating the Adolescence Conceptual Understanding Test (A-CUT) which can be used to measure the conceptual understanding of the adolescents.