concrete

in the context of the story, something real or definite


depleted

used up; gone; gotten rid of


extent

an area covered by something; in context of the story, how much knowledge you have about a particular subject


notion

a concept; a belief


prerequisites

something required in order to do something else; in the case of college, required classes to complete a major


undeclared

in the aspect of college, what you put down as your major if you don't know what you want your major to be yet


W-2

a form your boss will send for you to fill out so the IRS will know what to tax you