The study sought to find out teaching-learning environment in single teacher school and its affect on psycho—physical side of teacher in Vernacular Lower Primary stage in Kokrajhar District of Assam, India. The objectives that lead the study were single teacher school, multi-grade teaching and teaching-learning environment. The target population of the study was 37 single teacher schools cum headmasters of District Kokrajhar of Assam, India. A sampling of Purposive Sampling technique was used to select the single teacher schools from District Kokrajhar in between 2015-17 academic year. The study employed School Survey Method and a structured interview schedule as well as open interview was used as tools of the study. The data gathered was analyzed by the way of descriptive method of research. The study found out that the teaching-learning environment in school with insufficient staff is chaotic and the teacher suffers from unsatisfaction and physical and mental stress due to over work load which stretched their mental capability and greatly curtailed their teaching skills to be effective teacher to produce good students. The study concluded that a chaos teaching-learning environment and over working load stressed teacher physically and mentally which results ineffective teaching learning process in Lower Primary (LP) stage. The study recommended that required teacher should be recruited in every LP school to solve problems of teaching-learning process aroused by multi-grade teaching in single teacher school.
Keywords : Single teacher school, Multi-Grade teaching, Teaching-Learning process, Mental Health, effective teaching.