Ok so me is planning my future of studying music. I want to go to a music college next year probably and they said to enter, I must pass an evaluation exam about almost anything that concerns music and perform 3 songs of diff style on my main instrument.

I have no problem with the 3 diff songs but, what theory do I have to know??? I already know scales, modes, intervals, standart notations, chords theory and etc etc but I am afraid that they come with something extremly complicated?

Halp someone?
Most people do not graduate music college, and that;s the 5% or so percent of those that apply who get in. ( At least that's how it is around here, I live near Berkley.)
So...I can't really help you, but I can say that you should have a fallback plan.