The intention of this study was to investigate how perceived teachers’ competence and perceived classroom environment affect academic performance. Two hundred and sixty randomly selected final year National Diploma (ND II) students of the Federal Polytechnic, Ilaro, Ogun State, Nigeria were involved in this study. They were given two questionnaires that took approximately, fifty minutes to complete. The study was conducted in a classroom environment during regular school hours. After collecting information from the students through questionnaires, their comprehensive Grade Point Average (GPA) in previous year were also collected. This GPA data were then compared to the scores obtained from the questionnaires. This study concludes that there was a statistically significant relationship between teachers’ competence and GPA, and that there is a statistically significant interaction between classroom environment and students’ academic achievement. Consequently, it was recommended that governments and school authorities must embark on regular training programmes and encourage teachers advance their academic and professional qualifications so that they would be more competent. Also, stakeholders in education should formulate policies that will ensure the appointment of qualified and competent teachers as well as the adequate provision of academic facilities in all schools as such would result in higher academic achievement.
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