This research aimed to study the current state and needs, develop a program, and evaluate the effectiveness of a program designed to enhance learning management and classroom management skills for secondary school teachers using a school-based approach. The research was divided into three phases: 1) studying the current state and needs, 2) developing the program, and 3) evaluating the program's effectiveness. The sample consisted of secondary school teachers, experts, and teachers from Romburipittayakhom Ratchamangkhalapisek School. Research instruments included questionnaires, interviews, and tests, and the data were analyzed using basic statistics and t-tests. The research findings revealed that: 1) the current state of learning management was at a moderate level, while classroom management was at a high level, with the desired state for both aspects being at the highest level; 2) the developed program consisted of five components: principles, objectives, content, development methods, and evaluation, with suitability and feasibility rated at the highest level; and 3) the program's effectiveness showed that teachers had significantly higher knowledge and understanding after the development at the 0.05 level, exhibited high levels of behavior according to the program, and showed the highest level of satisfaction with the program.