On February 27, 2024, American Intercon School, Takeo Campus, organized a mathematics index teaching class for grade 2 by Teacher Ouch Kimleang. The purpose of an index teaching class  is to share teaching methods and teaching experience, produce materials, and enhance the quality of teaching to make students understand and grasp the lesson quickly. During the introductory classes, teachers have the opportunity to ask questions, solve questions, change methods, improve and fill in the gaps for the vehicle, as well as the key to their teaching more effectively and achieve the vision. 21st-century education: Active teaching, with the participation of principals, deputy principals, teachers, and students in teaching and learning collaboration, ended happily.