Am I good enough to get in to Exeter or Andover?

My public school is okay, but the teachers are all pretty terrible, we have very few clubs, and I’m about to run out of classes. My parents don’t have a huge income (very low end of “rich,” we wouldn’t qualify for aid), but they have a lot of assets because they used to make more money. Our house is like 1.3 mil, but they have a mortgage and that’s (I assume) where a lot of their money is going. Also I have 4 younger siblings, so they need to save money for their college.