Secondary Demonstration School of Bansomdejchaopraya Rajabhat University

The Secondary Demonstration School of Bansomdejchaopraya Rajabhat University (โรงเรียนมัธยมสาธิตมหาวิยาลัยราชภัฏบ้านสมเด็จเจ้าพระยา, Abbreviated B.S. or บ.ส.) is a school in Thailand, first established by East Teacher Training School Chaopraya Pasakorn. The school was first conceived by King Rama V of Thailand and is home to a preschool, pre-primary school, primary school, and secondary school.

The secondary school, which is commonly referred to as Satit Bansomdej, aims to prepare students for university-level work by providing them with the responsibility to manage their study schedule independently. Exam questions at Satit Bansomdej are often based on university tests, which follow the teaching principle “Difficult tests make students try harder.”

Students manage their activities independently with little assistance from their teachers. One of the most popular activities students undertake is the Satit Rajabhat Sumpan Games. These include a series of competitions in many different sports, as well as cheerleading and parades for other schools affiliated with the Rajabhat University system. At least nine demonstration schools of Rajabhat University join the games, with the cheerleading competition considered the highlight of the event.

Instructions at Satit Bansomdej are designed to develop students' social skills as well as work skills, with a focus on practicing the self-control necessary for an effective education. While students can choose to skip classes, they are actively encouraged to attend all lessons and explicitly instructed of the negative effects of absenteeism.