Well, spoilers, but Simon is going to be a photographer when he exits school. It's one of his passions and while he was always good at learning, it didn't bring him all that much Joy.
Joey on the other hand is going to study business economics and ends up as a successful CEO. He would have also loved to become a history teacher, but he still has a lingering feeling of pressure of his parents and considering the carreer prospects of studying history he chose the former option.