The title says it all - how difficult is working at MBB? You can hear different opinions on this - some people say that it is incredibly tough, while others claim that a lot of tasks are not very demanding. On the other hand, it seems like you need to be extremely intelligent and be super proficient in quantitative analysis to exceed there. All of this sounds quite intimidating. So I wonder what is true - is a high level of "inborn" intelligence required, or is it more about hard work and staying career-focused?