The Registration and Evaluation Unit was established in April 1973, during the time when Associate Professor Dr. Theerachai Puranachote served as the Headmaster. The first head of the unit was T. Chompit Deevajin, and the unit was originally named the "Registration Unit" and was directly under the Administrative Department. Assistant Professor Attasit Samatkarnaksarakij served as the Deputy Headmaster for Administrative Department. The objective of the Registration Unit was to serve as a storage of student data center, such as academic results and the issuance of various official certificates.

Later, when Associate Professor Niramol Sawatdibutra served as the Headmaster, the Academic Affairs Department was established to oversee and manage the teaching and learning operations in accordance with the Ministry of Education's curriculum. The Registration Unit was then moved to report directly to the Academic Affairs Department to align with its scope of work while Assistant Professor Boonchai Pinyoanantapong served as the Deputy Headmaster for Academic Affairs..

In 1993, Associate Professor Noppong Boonyittradul served as the Deputy Dean performing the duties of the Headmaster. During this period, the "Registration Unit" was renamed the "Registration and Processing Unit". Associate Professor Suchawadee Eam-ornpan was the head of the unit at that time.

In 2005, Associate Professor Veerachat Suanphairin served as the Director of Chulalongkorn University Demonstration Secondary School and Deputy Dean of the Faculty of Education. The "Registration and Processing Unit" was then changed to the "Registration and Evaluation Unit".

• To develop assessment and evaluation criteria.
• To ensure that learning management can respond to the needs of the students.
• To disseminate knowledge regarding assessment and evaluation to the school's faculty members.