There are many factors responsible for the academic achievement of high school students. To state a few examples such as good teachers, study habits, certain psychological factors, home environment, social environment, peer relation etc. School environment must be conducive for the students for their study. Half of the day is spent in the school and the students see many people like their teachers, administrative officers, and other fellow students, in today’s context, the schools are facing many hurdles to maintain a good atmosphere for teaching the students. Therefore this study aims at throwing some the school environment and academic achievement of high school students. The study was conducted in Kallakurichi, one of the educational districts of Tamil Nadu and survey method was deployed. The sample was divided into different categories on the basis of gender and medium of instruction. Covering the entire population is not possible for the present study. The current academic year high school students (2024-25) were selected and 300 samples were considered for the present study. The present study highlights that the school environment does not affect their academic achievement. It is presumed that the students perceive a conducive atmosphere in the school and it has neither positive nor negative effect on their achievement. Besides this there may be some other factors such as parents encouragement, peer support, teachers’ role model etc which will have a positive impact on the high school students. The school environment as perceived by high school students was found to be at moderate level which indicates that the school administrators, teachers should undertake every step to develop and ensure a healthy and friendly environment in schools.