1. How can you become one? like do you need to know math really good?
or what subject is the most important for that profession?

2. and what do you do, specifically?
CEO stands for Chief Executive Officer. This is usually the highest position possible within any corporation. What that corporation does will dictate what skills the CEO needs and what he will be responsible for. Like most jobs, there is not a universally consistent set of requirements and duties; it varies from company to company. In the US today, the typical CEO has an advanced degree (Master's or higher) but the subject of his or her studies varies widely; it can depend on what industry they are in, though many CEOs hold degrees that have nothing to do with the field they actually work in. Math is always a good skill to have, but a CEO is usually an extremely well-rounded individual and has a high degree of intelligence, shrewdness, ruthlessness, luck and charisma. A CEO usually determines the business strategy for the company overall, and serves as the primary spokesperson for the company.