Abstract
This study investigated the relationship between selected teachers’ demographic characteristics and
classroom instructional practices and students’ academic achievement in selected secondary schools
in Nyandarua County. One hundred and fifty three teachers selected randomly from eighteen
schools in three districts in the County participated in the study. The schools were categorized as
above average, average, and below average based on their aggregate performance in Kenya
Certificate of Secondary Education (KCSE) in the last three years. In each category, two schools per
district were selected. Data were collected using a questionnaire developed by the researchers.
Linear regression and One-way ANOVA were used to test the relationship between the selected
variables and performance in KCSE at p