A person who is extremely proud of his or her abilities will often suffer a setback or failure, because he or she tends to be overconfident and to make errors of judgment
(Atasözü) (British & Australian) also Pride goes before a fall. (American)something that you say which means if you are too confident about yourself, something bad will happen to show you that you are not as good as you think you are
Just because you did well in your exams doesn't mean you can stop working. Pride comes before a fall.