The current study was designed to investigate the impact of learning environment of cadet colleges on personality development and life success of students in Pakistan. Objectives of the study were to explore various aspects of learning environment, assess the impact of learning environment on personality development, analyze various dimensions of life success, determine the influence of learning environment on students‘ life success and examine the mutual impact of learning environment, personality development and life success. This study was descriptive and exploratory in nature therefore triangulation research design of mixed method was considered appropriate for its completion. The population of this study was comprised of worthy principals, teaching faculty, intermediate students and alumni of recognized cadet colleges of Pakistan. Convenient sampling and snowball sampling techniques were used for the present study. The sample of study consisted of 500 respondents which were alumni of twenty four cadet colleges. Moreover, interview was conducted for the principals of twelve cadet colleges and observations were also recorded. Two type of data was required, one in the form of questionnaire from the alumni of cadet colleges about learning environment, personality development and life success keeping in view the objectives of the study. Secondly, semi structured interviews of the worthy principals were conducted. Two observations were also recorded though documentary record and observation sheet at cadet colleges during the interview of the principals. After pilot testing, the researcher personally administered research tools and collected data from the respondents. After data collection, the data was analyzed using SPSS version 21.0. To describe the characteristics of respondents, t-test and One Way ANOVA were run. However, to analyze the subjective data, inferential statistics were used. Correlation and regression analysis were used to infer the respondents‘ questions. Qualitative data was analyzed by using NVivo 12.0 software and major themes were extracted by using data reduction techniques. The results show that learning environment is a contributory factor in grooming and developing the personality domains of the students. It also plays an important role towards incremental improvement in life success of the students. There exists a strong positive correlation between learning environment and personality development as well as between learning environment and life success. Also, there is a mutual impact among learning environment, personality development and life success. Resultantly, cadet colleges bring substantial change in their students by providing effective and conducive learning environment to their students. The same model can be applied to other public sector educational institutions of Pakistan. In nutshell, the authorities and people at helm of affairs in Pakistan should improve the learning environment of their academic institutions in order to gain the objectives of education, for which plausible recommendations have been proffered in this research.