The most important thing you can be doing right now is keeping those grades up! Keep in mind that your second semester of this year will be the last semester of grades that colleges will see when you apply. So if you've had any dips, work hard now to make it an upward trend.
The next thing you should do is research colleges - and NOT just "reach" schools - research colleges whose average test scores are a bit below yours. I promise you they aren't "dumber" just because their scores are lower than yours! These are the schools that will REALLY WANT you and are most likely to give you a scholarship.
Here's more info on researching and building a balanced college list: