Only thing you can really do that would be beneficial is to start getting a vague idea of what you want to achieve. Not to say that you should map out every class and club for the next four years, but you should consider if you’ll want to eventually go to a top tier school or not. If I’d known early on how different an 89 and a 90 are in GPA calculations, what doing well on the PSAT could do for me, or how much I loved debate AND how good it looks on apps, I would be in a very different position right now.