If your high school offers any business related classes (accounting, personal finance, management, economics, data analysis, etc) start there! In addition, the business world requires a lot of other skills, such as communication and problem-solving. While you may not need complex math skills in a business job, taking some tougher math courses can help you think through numerical problems to find creative solutions. Similarly, philosophy and sociology classes encourage you to see things from a different perspective, which can be a great skill to bring to the table in a business position. Finally, english, public speaking, and creative writing courses can help you better express yourself, both in writing and verbally, which is arguably the most important business skill to have. Communication dominates the business world, even more so than technical business knowledge. Remember - if you can't clearly and easily communicate what you need to say to clients, coworkers, or investors, your business knowledge is irrelevant. Getting your point across is always the top priority in business.