Hey,

I'm somewhat well versed in college admissions so I might be able to help you a bit (hopefully).

Firstly, /u/coffeeshopsnob is probably correct. Schools like that have very bad-ass college admissions councilors. A councilor in one of those elite prep schools was the dean of admissions at columbia at one point.

This will sound cliche but it's true: colleges look at you as a whole person. Singular factors don't really matter, you need to be the type of person they like. Usually, colleges like hard working smart people. These people generally tend to have high SAT scores and GPAs but that doesn't mean you can't get in. But that doesn't mean these things are not important. I believe if you get your ACT (or SAT) over 34/2250 and get a 4.0 this year, you won't have your grades weighing you down. Do you have a reason for not getting higher marks? Your school being hard won't matter unless you are ranked in the top 5% of your class?

Now, you haven't given very specific info about your extra curricular activities so I can't really judge (if you feel comfortable PMing them to me, feel free to do so) but essentially how much you applied yourself matters. Did you apply yourself to the fullest in them? Did you 'climb up a latter'? Did you achieve anything? Most colleges, namely MIT, want focused ECs. Having a laundry list of activities won't help at all. You need to show a deep interest in your activity or you must show a thirst for exploration to find your passion. Have you done that? What about leadership? These feed from their prestige. Have you shown that you are likely to be a guy that people look up on Wikipedia and see that you attended their school?

If you have, you have a shot. If not, you don't.