Short Class

The elementary Music class was already getting a little difficult...
Today, we learned Triads; major, minor, diminished, and augmented one. Except for major triads, those are all sounded similar to me. If there are ear-testing, I'm sure that I can't distinguish them.
But we have only four days more for this class; tomorrow, Friday, then next week's Monday and Tuesday, but the next Tuesday is the final, so I guess only three days more for the lecture. This class lasts only a month, and so we are running materials so fast. Because I already knew about 80% of the materials, ( we started from the very basic; whole note, half note, quarter note ... pitches of CDEFGAB etc) I didn't have to study so hard. But I guess if someone don't know well from the notes, it's a very difficult class.