How do I know if I’m a good mathematician? I get good grades in certain areas such as abstract algebra, graphs, number theory, but low grades at analysis, probability etc. (I’m math undergrad). But I don’t know the percentage of “knowing math” I need to know to be in a graduate school. Hell I don’t even know if I would be a good researcher. It is my dream but I feel like I’m only slightly above average and don’t want to get burn out when I start to do serious research. Any professional mathematicians here who can give me advice? How is your daily job and how do you avoid burn out?