Why are my titles so irrelevant?

During the test last week's test I found that the vast majority of things I missed were not concepts, but little things that I was not originally taught last summer. I find myself skipping over the concepts I already know and lumping those i do not know together with them. Thus, I think I am going to start taking notes that are more relevant to my knowledge rather than one whom has just been introduced to java. Otherwise I'm just getting used to the conventional format for things, though I do not feel I am having problems with this.

On a completely different subject, I'm wondering about the validity of this:

http://xkcd.com/519/

and how serious he was being about this.

Either way, this class seems to be a good thing to get into.