The first reason they succeed is because they’re scared that if they mess up then it will affect their descent into college. For instance, there are two students and they are both freshman. One has college in mind while the other couldn’t care less about success and cares only about fun and barely getting by. They are assigned a paper that is due in three days, the boy that wants to get into college works on it for all three of those days while the other does the assignment the night before it’s due. The hard worker gets an A while the other gets a C.
The second reason is because they do not like to disappoint. When they disappoint someone important to them it ultimately means failure. They work hard so that they can make loved ones proud of them and when that happens they tend to work harder. There is a freshman who always get detention or gets sent to the principal's office. Everytime she gets it though she cries. The teachers believe it is because someone at home is abusing her but in reality the girl does not like it when her mom gets disappointed with her. This feeling makes her feel small and incompetent.