Hi Priya, is this for academic study? If so, the first person you should consult is your supervisor. There is lots of research that has sought to show the relationship between class size and achievement, and a lot of large scale studies have already been done. For example, the 4-year large-scale randomzed experiment called project STAR in Tennessee, which is very often cited. http://aer.sagepub.com/content/37/1/123.short
Are you planning to do your own primary research or is your aim to synthesise research that’s already been carried out? As I said, your supervisor/teacher/research advisor is the best person to discuss this with if you’re doing research to meet academic requirements, as they will vary from institution to institution and we wouldn’t want to give you advice that didn’t match your the requirements of your course.
Best of luck!
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