Yeah, I was pretty lame in my senior year of high school. It seemed like all of my past semesters and years of school just beat me up and made me lose my drive...it happens to the best of us.
I did not really care for bringing my grades up by doing extra projects. I made it so yeah.
I suppose you just have to try your best or just "get by" if you are not feeling it anymore.
Maybe talk to someone at school that can help you out or something.
You are almost there though so just keep on trucking....yeah, I suck at motivating but you made it this far.