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One of the important competencies that need to be focused on when forming and developing for high school students, is cooperation capability. Students cooperate to solve problems in learning and life; build relationships, learn from each other, and help each other grow together. This article presents the application of the teaching method in the corner, the teaching technique of mind mapping, and the KWL technique to maximize the cooperation between students in the same group to solve the learning tasks in a corner. Instead of teachers using visual methods, experimental methods, and small group cooperation methods to guide students to acquire knowledge, in this experiment, teachers ask students in groups to cooperate with each other to self-determine goals, make plans, assign tasks, share ideas, listen to each other's ideas, and support each other to complete learning tasks in the corners. Teachers only observe students organize learning activities and provide support when needed. The results of applying these teaching techniques and this corner teaching method to the development of students' cooperative capability show that students' cooperative capability is developed through teaching Chemistry in high schools.

Developing students' creativity and problem-solving capability is a necessary, important, and long-term goal in high schools. Integrating STEM topics into the high school curriculum through interdisciplinary integration of subjects to solve real-life problems helps learners create practical products with useful application. Thanks to the STEM topics, learners are encouraged to apply their acquired knowledge to solve specific problems in real life, from which many different competencies are formed and developed for students especially problem-solving and creativity. The article presents the impact of applying STEM topics in teaching Chemistry to the development of students' creative and problem-solving abilities, the process of designing STEM topics in teaching Chemistry, the steps to implement the topic, product evaluation criteria, evaluation criteria for component competencies of creativity and problem-solving capability, and the results to develop students' problem-solving and creative capability through experimental teaching activities in high schools. The data obtained from the teacher’s assessment and the students’ selfassessment showed obvious development of students’ creative and problem-solving capability in the experimental class.