what should I study for

That’s a great choice in mind. It good to keep your abilities in mind. Ask yourself if you could see yourself doing all the things firefighters do. What are ways you can prepare yourself for whatever field you’re interested in? (Even if it’s something small like fitness or mindset). Now I’m not sure if you’re into organizing or planning or being a leader in some sort of project. Project managers are always on the go. They always have to go to places where they can hire people, they must supervise their employees, and when they have various projects it’s even more busy. But it’s just a suggestion! Usually project managers don’t need degrees you can mostly just be certified. And you can be a project manager in practically any industry if you think about it.