There is no such thing as a useless class; learning is always worthwhile.
You have no idea when knowledge will come in handy. It might come in handy every day, occasionally, or for the odd request at work; it might draw people to you at a party; it might impress others in an interview; it might win a game show for you.
Regardless of its application, knowledge itself is power… because it makes you better. It helps you realize the full potential, the manifest destiny, of your cognitive faculties.
While you still can, take advantage of what your school offers and learn everything you can. You’ll improve yourself by doing so.