The sociology of culture, and the related cultural sociology, concerns the systematic analysis of culture, usually understood as the ensemble of symbolic codes used by a member of a society, as it is manifested in the society.
Among sociologists, “culture” just as often refers to the beliefs that people hold about reality, the norms that guide their behavior, the values that orient their moral commitments, or the symbols through which these beliefs, norms, and values are communicated.
Culture encompasses human elements beyond biology: for example, our norms and values, the stories we tell, learned or acquired behaviors, religious beliefs, art and fashion, and so on.
Sociology of culture is important because culture influences people's beliefs and behaviors, culture is a key concept to the sociological perspective. Many sociologists are wary of biological explanations of behavior, in part because these explanations implicitly support the status quo and may be used to justify claims of biological inferiority.
Auto insurance companies offer discounts if you are good student, or full time student (which includes your gpa).
grants and scholarships are rewarded by good grades and succession of essay writing.
students will get kicked off their athletic team if their GPA is too low.
That singles out comparing yourself to your friends, which should be obvious that this one's excluded. ☺