The purpose of this study was to investigate the school based factors affecting the performance of C.R.E. in Kasarani Sub County, Nairobi County. This study was guided by the following four main objectives: To establish the attitude of students towards C.R.E., To find out whether there are adequate reading resources for C.R.E., To look for ways of improving the reading culture among students in C.R.E., To determine ways of motivating students in cultivating a reading culture for C.R.E. so as to improve their performance. Simple random sampling was done in the selection of schools and out of a total of about thirty schools in the sub county, only six schools were selected for the study. Similarly, the group of students selected out of the total number that exists was a hundred and twenty, through random sampling. The study used descriptive survey design that inclined to the quantitative research approach. This was through simple random sampling and purposive sampling to select students and teachers. Purposive sampling was done so as to give a wider picture of reading culture in small schools where resources are few, medium schools where resources are moderate and big schools where they have more resources. The sample comprised of a hundred and twenty students in Form 3 and Form 4 from the six selected schools in Kasarani Sub County. Each school provided twenty students to be included in the study. The reason as to why the senior students (Form 3 and Form 4) were included in the study is because they have formed a consistent pattern of reading. Therefore, their performance (form 3 and form 4) can be easily monitored according to the established performance trend. Another category of the sample comprised of twelve C.R.E. teachers from the six schools, with each school providing two C.R.E. teachers for the study. The last category was made up of six head teachers from each of the six selected schools in Kasarani Sub County. Questionnaires were used as an instrument of collecting data hence the cumulative findings obtained were inspired by Walberg’s theory of educational productivity for the ultimate validation. The findings indicated that students have a negative attitude towards C.R.E. and not much has been done to motivate them to improve their performance in C.R.E. However, the researcher recommended various ways of addressing performance in C.R.E. among the students. Looking at the adequacy of reading materials, it is only one or two of the selected schools that are actually working extra hard on having adequate reading materials. Similarly, the researcher recommended a workable plan that can help to solve this challenge. In determining ways of motivating students to improve their performance, the findings were not equally encouraging. As a result, the researcher outlined the ways forward to confront the setbacks.