There are many ways to learn more about a career in investor relations and the venture capital industry. Check out books such as The Handbook of Financial Communications and Investor Relations (Wiley-Blackwell, 2017) to learn more about the art of investor relations. The Venture Capital section of PitchBook offers industry news and insights (https://pitchbook.com/news/venture-capital). And publications such as IR Update (https://www.niri.org/resources/publications/ir-update) and IR Magazine (https://www.irmagazine.com) provide information on the latest IR trends, developments, and best practices.
It will also be beneficial to learn as much as you can about the business world. The Wall Street Journal (https://www.wsj.com) is a good source of information about major companies, breaking business deals, and government regulations that affect the VC industry. Take marketing and public relations classes in high school. Offer to create a marketing campaign for a school fundraiser, play, or sports tournament.