It's an important life tool and, honestly, if you learn to be fluent in a language, chances are you won't forget it after you graduate if you keep in practice. Learning a language opens the door to millions of other people and experiences, and can help you to understand the world around you. You can use the Internet to find out about nearly anything on the whim these days, but language is the one thing that you can't just Google. You need to fully understand it in order to make proper use of it, making it a VERY important school subject.