It's easy to not take this seriously, but this is your first look at what the SAT looks like. If you take it seriously, you can have an upper-hand on the SAT when you take it your junior year. Your test score can also be indicative as to what you would have scored if you took the actual SAT. Try to do as best as you can do!
Hopefully you started looking into colleges your freshman year. If so, continue that research and continue talking to your advisor. If not, thats okay, you can start now! Get in contact with your advisor to find the best university for you!
This may be a little hard to do right now, but that doesn't mean you can't think ahead for next year! Are there any clubs on campus that interest you? If not, maybe you would like to start one!
How about sports? Do you play any? If so, try out for the team!
Do you do anything outside of school? Help out your parents, work, play a club sport, etc.? If not, it's never too late to join for next year!
Clubs, sports, and extracurriculars (ie activities after school) all look great to colleges. See about trying a few out!
Your advisors are trained to help you with the entire college process. Not sure what you should be doing? Ask them! Have a specific problem/question? Ask them! When in doubt, always ask your advisor! They are here to support you in any way they can :)