Since your grades and SATs aren’t impressive, focus on extracurricular activites, and I mean focus. The easiest way is to join clubs (with the intention of becoming an officer the following year), but since you’d only be starting junior year it’s probably okay to just volunteer outside of school. Put a lot of effort into volunteering, though, don’t just do it so you can put it on your application. That’s cheap. Plus, if you work hard, you can get a good recommendation from your supervisor.

Your question “are those enough?” worries me. If you really, really want to get into this school, that’s the wrong type of attitude to have. Do as much as you can.

Junior year counts the most, but senior year is important as well. Colleges evaluate your grades at the end of the year as well, and if they’re not happy with them, they have every right to take you off the accepted list.