How can I make my dad realize I can't get into the colleges he is convinced I can get into..?

I found some of these articles interesting. The first (from 2014) argues that it is, in fact, no more difficult to be accepted to selective schools now (or in 2004, to be accurate) than it was in the 1990’s:

http://www.theatlantic.com/education/archive/2014/04/is-college-really-harder-to-get-into-than-it-used-to-be/360114/

The other (from 2001) is an interesting analysis of how ED favors increasing the quality of student admitted, as well as the selectivity of the school (albeit by disadvantaging the student), and shows how University of Pennsylvania used this approach to advantage:

http://www.theatlantic.com/magazine/archive/2001/09/the-early-decision-racket/302280/