Academic achievement can be defined as an academic result or numerical score obtained within an educational exercise of teaching and learning after undergoing a due process of examination or test. Specifically, it is a measure of the extent to which educational objectives has been attained. Academic achievement can also be defined as the observed and measured aspect of a student‘s mastery of skills and subject contents as measured with valid and reliable test
CLASS SIZE
The increase in population in a school affects the class sizes, the performances of students become an issue. Class size refers to the number of students in a given course or classroom, specifically either the number of students being taught by individual teachers in a course or classroom or the average number of students being taught by teachers in a school or educational system.
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The term may also be the number of students participating in learning experience. Class size is almost an administrative decision over which teachers have little or no control. Class size refers to an educational tool that can be used to describe the average number of students per class in a school. There are large and small sizes in school. The smaller the class, the greater the likelihood is that a teacher will spend more time with individual pupils. Large classes present more challenges for classroom management, pupil control, and marking, planning, and assessment. Teachers are put under more strain when faced with large classes. In smaller classes, it can be easier for teachers to spot problems and give feedback, identify specific needs and gear teaching to meet them, and set individual targets for pupils. Teachers also experience better relationships with, and have more knowledge of individual pupils.
ACADEMIC PERFORMANCE
Academic performance of students can be evaluated in many different ways, but in a developing country like Nigeria where about most of the adult population are illiterate, parents use the performance of their children in universities to pass judgment on the schools and teachers. To them, the logic is a simple one. The schools are supposed to be staffed by good teachers and supplied adequate facilities and instrumental materials.

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It is the responsibility of government to ensure through such provisions and regular inspection or supervision that effective teaching and learning go on in the schools. The task of parents is to send children to school and pay whatever fees and levies are charged by the institutions. Though many parents acknowledge shortages of funds, teachers and infrastructures in the schools and their own inability to buy all the required books and other learning materials for their wards, yet they strongly believe that if the students perform badly in their examinations, the teachers and administrators have not done their job well and should take most of the blame.
CLASS SIZE AND STUDENTS INTEREST & PERFORMANCE
Interest is an emotional state of a person prompting such person to cognitively engage in learning activities and seriously desiring to know. In another opinion, interest as a condition in which an individual associates the essence of certain things or situation with his needs or wants. Interest is also defined as specific predispositions of individuals which can develop over longer periods of time. Interest is often thought of as a process that contributes to learning and achievement.
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It has been opined that academic interest can help students of natural sciences deal with learning struggles and achieve high performance. Students’ interest in learning has been observed to correlate significantly and positively to academic achievement; thus, interest in learning significantly predicts their academic achievement. The higher the levels of interest of individual students in natural science subjects, the higher the achievement in those subjects. Class size can be defined as the number of students in a class at a given specific time undergoing teaching and learning instructions of a teacher. In a similar version, class size can be seen as the number of students per teacher in a given class.