The teacher told me that everything was destiny takes a hand. How can I refute it?

If everything is predestined, then why bother? If everything is destiny takes a hand, isn't all the efforts in vain? Then why should we work hard? Why should we work hard? According to what you said, we don't have to take an exam, just find a fortune teller to tell our fortune. Anyway, everything is destiny takes a hand, some people just can't pass the exam, so we might as well go home and work early. We don't need to work hard to make money. If we are doomed to poverty, what else can we earn?