Northwestern?

I'm only a sopre in high school, but every now and then I think about college, and now is one of those times. I really want to get into Northwestern (Chicago). I have a 4.2 at my school, but my school is more than likely a very low ranking school when it comes to scores. I didn't do any extra-curriculars in freshman year, but this year I'm in NHD club, a student tour guide for the incoming freshman, and I did track training for some of the time it was available [then school started again, and I need to get a job ASAP, so I quit]. Also, I will be in the Math Tournament in February and trying out for the NHS in the Spring. Also, I've taken the PSATs. Are my chances good for getting in if I keep this kind of work up?